The remains of 11 female bodies are found in the desert outside of Albuquerque, N.M.

As detectives struggle to find leads in the murder of a college student, the perpetrator strikes again.

An in-depth look into the disturbing murder of Travis Alexander.

An in-depth look into the disturbing murder of Travis Alexander.

Even as Jodi Arias continues to make headlines, a look back at the media circus surrounding her 2013 murder trial.

The murder of a church choir member reveals a sordid secret and an unlikely love triangle.

A man's roadside shooting leads to the discovery of his wife's double life.

Betrayal and finger pointing occur in the investigation of a murder in an isolated parking lot, which has multiple suspects.

A suspicious shooting reveals a real estate agent's scandalous secret life.

The brutal murder of a homecoming queen shocks a town.

A custody battle, a shooting and a suicide on the train tracks.

An Atlanta woman's secret addiction is revealed when her doting husband is gunned down.

Police are lead to a family conspiracy after a brutal slaying and a car fire.

An Ohio man is thought to have committed suicide but new leads could implicate his fiance.

A bizarre bombing, a body in a freezer and a jilted boyfriend lead police to a woman with a notorious past.

A woman blames mistaken identity on her boyfriend's death.

The mystery of a former Vegas showgirl, a dismembered body and a missing husband.

A college instructor calls 911; a murder scene or suicide.

A hunter's death has authorities tracking a killer.

Serving a 60-year prison sentence, Rebecca Keller reveals chilling new details about the night she stabbed her then-girlfriend's mother more than 70 times; she opens up about her regrets and why she thinks the crime took place.

A suspicious fire and a secret lover lead officials to ask if the wife was involved.

A journalist embarks on a 40-year quest to uncover the motives of one of the most prolific spree killers in history; the result is 500 hours of secret tapes and an obsession that blurs the line between reporter and subject.

Robert Davis, who was convicted of murdering a woman and her son, claims his confession was coerced and tries to prove he is innocent.

An investigation into the murder of a beloved couple in South Carolina reveals a feud and divides a family.

When a Chicago woman from a big family goes missing, investigators begin to suspect a man in her life is full of secrets.

When Israel Keyes is caught for the murder of 18-year-old Samantha Koenig, police have no clue what they've stumbled upon; after intense games of cat and mouse, the FBI uncovers one of the most calculated serial killers it has ever encountered.

A beautiful blonde seduces various lovers in a small town, causing havoc; it isn't until an unlikely witness steps forward and another tragic death occurs that the village becomes aware there is a cunning and charming killer in their midst.

When a Jeopardy-winning colleague romances Linda Kinkade, it seems she's won the jackpot until she dies mysteriously; it takes a wily cold-case cop to uncover an overlooked clue to put a killer behind bars.

Single mom Margie Danielsen falls in love with a handsome chef, but when an episode of "America's Most Wanted" airs, she realizes she may be far too close to a fugitive and must risk her life to bring him to justice.

When a dance instructor waltzes into widower Alan Helmick's life, he is elated until someone inspired by a movie puts an end to his dreams; It will take a savvy team of investigators to bring a killer to justice.

Kathi Spiars believes she's finally met Mr. Right when an ex-CIA agent gives her everything she's ever wanted; the honeymoon is over when she discovers a dark secret and then chooses to risk her life to bring an elusive killer to justice.

Policeman Glenn Turner is over the moon when a beautiful 911 dispatcher woos him with luxurious gifts, until he dies suddenly from natural causes; when a second man dies unexpectedly, his family searches for the truth to stop a cold-blooded killer.

Dewayne Barrentine thinks he has found the perfect mother for his young son, until he stumbles on a mysterious message from another mother looking for her own missing son.

When Girly Chew meets a charming doctor, she believes her American dream has come true; her co-workers become alarmed when she goes missing, and investigators are confronted with a bizarre case involving UFOs and alien queens.

A journalist embarks on a 40-year quest to uncover the motives of one of the most prolific spree killers in history; the result is 500 hours of secret tapes and an obsession that blurs the line between reporter and subject.

A college student turns up dead and her boyfriend becomes a prime suspect when blood splatters are discovered on his wall.

Texas police hunt frantically for a brutal rapist. No one knows where he'll strike next, but given the increasingly violent nature of his crimes, he must be found soon.

When detectives find a mismatched button in relation to a woman's death, they know they can follow the clue back to the killer.

A woman heads home after church, but never makes it there alive, triggering a homicide investigation.

Volunteers and police spend weeks searching for a missing girl. A psychic later leads them to a field where the body was found.

Forensic investigators try to stop a killer who is apparently responsible for two slayings in a community in South Carolina.

When DNA proves that a man who practically admits to a brutal attack is innocent, police wonder why he is willing to take the blame.

When a businessman is murdered, motives and suspects are plentiful. Was it simply a disgruntled employee or client? Or do some racy photos hold the clue to the crime?

A family break turns into a nightmare when the wife is found face-down in a lake; with no idea whether it was murder, an accident or suicide, police turn to a new forensic technique.

When friends see a woman in the back of a car flailing her arms and screaming, they assume she is having fun, but when they later come upon a jacket and a pool of blood, they realize they witnessed an abduction in progress.

An attack on a couple's home leaves the husband dead, the wife gravely injured and their son as a prime suspect; hundreds of miles away, a DNA sample may lead to the killer.

Detectives think they've solved a murder when they find the weapon and victim's blood in a man's flat, but the evidence may have been planted.

Detectives search for the bombers of two churches in Illinois, hoping that the materials used in the remnants of the handmade bombs will offer the clues to catch the culprits.

There was no apparent reason for the young, healthy college student to be dead; but when the medical examiner found the tiniest of clues during the autopsy, investigators were able to unravel the mystery of betrayal and revenge.

A devoted husband, military man, and father of three calls the police with a chilling confession: he's shot his wife; what first appears to be a straightforward homicide soon unravels into something far more complex.

Serving a 60-year prison sentence, Rebecca Keller reveals chilling new details about the night she stabbed her then-girlfriend's mother more than 70 times; she opens up about her regrets and why she thinks the crime took place.

Investigators search for a New Mexico mechanic who has been missing for eight years.

Investigators search for a New Mexico mechanic who has been missing for eight years.

After a woman reports a prowler, police find her Olympic bronze medalist husband dead in their backyard.

After a man is found brutally murdered inside his own bar, a murder mystery unfolds over the span of years; detectives believe it's a business deal gone bad and must remain steadfastly dedicated to the case after hitting several dead ends.

In the summer of 1991, a pair of half-siblings creates panic across southern California when they embark on a spree of random crimes of the worst kind, targeting people out doing everyday tasks.

Over a brutal 7-month stretch, a trio of brothers commit a series of increasingly violent crimes across the city of Richmond, leaving behind a growing body count; even after their apprehension, these brothers prove difficult to contain.

A pair of larger-than-life identical twins commit a series of brutal attacks in a small Tennessee town; with each crime, the brothers grow more emboldened; as time goes on and with little evidence against them, there's no telling how far they'll go.

When a correctional officer is murdered, it seems like an act of vengeance, but a love triangle is exposed; after learning his wife is having an affair, a husband plans to kill her lover and enlists the help of his brothers to carry out the task.

An Oregon grandmother found wounded on the roadside tells rescuers that her husband is missing after a boat sale went awry; a manhunt ensues but as authorities investigate, granny's wild story unravels to reveal a darker truth.

A California Granny is thought of as a Mother Teresa to the downtrodden thanks to the boarding house she runs; but when a social worker raises fears for a missing client, investigators find that Granny's carefully tended garden hides horrors.

An Army vet is found dead on his farm; it first looks like the tragic suicide of a troubled veteran, but police uncover a sprawling cover-up and two grannies whose dueling stories collide in a troubling she said, she said murder mystery.

A talented, young art student is murdered; the killer left no fingerprints and no DNA; police zero in on three fellow students and, soon, the dark portrait of a killer began to emerge.

Fitness executive Nicole Pietz is married to the man of her dreams, then she goes missing after failing to show up for dinner with her husband and friends.

Debbie Kelly and Lars Itzo make their marriage of opposites work; then, Debbie is shot dead in the dark of night; investigators ask whether her death is a case of mistaken identity or the bloody end to a marriage gone bad.

Detectives search for answers after Annastasia Hester is stabbed to death in Portland, Oregon; investigators uncover personal details that point to multiple suspects and possible motives.

After the wife of a college professor and heir of an oil empire is found murdered in her South Florida home, footage from the home's security camera could hold the key to finding the killer.

Tara Ord is a beautiful young woman with big dreams, then she vanishes without a trace; it will take years for determined cold case detectives to uncover the long buried clue that blows this case wide open.

After the wife of a college professor and heir of an oil empire is found murdered in her South Florida home, footage from the home's security camera could hold the key to finding the killer.

This feature documentary focuses its lens on a horrific crime in a bucolic college town after four University of Idaho coeds are brutally stabbed to death and a brilliant criminology student, Bryan Kohberger, stands accused of their murders. As prosecutors and defense attorneys sift through the evidence, the motive remains a baffling mystery.

Insights into the story of the private royal, including a look at Diana's troubled marriage, her turbulent life in the royal family and the investigation into her death.

Insights into the story of the private royal, including a look at Diana's troubled marriage, her turbulent life in the royal family, and the investigation into her death.

When remains are found amid the rubble after a house fire, authorities soon discover the incident was no accident.

A cold-blooded serial killer lurks in the woods, stalking for his next victim; as Detective Bernie Nelson investigates, puzzling evidence leads him to more questions until one clue help crack the case wide open.

Phoenix Coldon vanishes; investigative reporter, Shawndrea Thomas, and retired deputy Police Chief Joe Delia attempt to unravel the mysterious unsolved case in the hope of finding justice for Phoenix.

Joe and Shawndrea follow up on a handful of Phoenix sightings since her disappearance and begin to question whether she'd been lured into a new life more dangerous than she could have anticipated; a surprising lead goes to an unexpected locale.

Julia Phillips orchestrates the murder of her boyfriend Melvin Roberts outside his home on her birthday in February 2010.

The murder of a Texas man reveals a deadly love triangle.

When a young Marine goes missing, police uncover a deadly plot.

A school nurse pulls the trigger; investigators must determine if it was in self-defense or if it was murder.

A man with both power and prestige managed to fool everyone, right up until his arrest.

Andrea Canning reflects on a case fueled by a rage so hot, it is seared into her memory; the battle between a wife and a mistress for one man's heart led down a deadly path, to a showdown on the highway.

A woman finds her father, a former FBI agent, murdered at his house; after digging into his past, police suspect the killer might be close to home; for Josh Mankiewicz, the toxic marriage at the heart of this case makes it unforgettable.

25-year-old Chantay Blankinship's remains are found at a rundown building that locals call the Haunted House; for Blayne Alexander, this case juxtaposes two places that represent good and evil, a church and an abandoned farmhouse.

Authorities take two years and three trials to solve the shooting death of the wife of an FBI agent in the kitchen of her family's Virginia home.

When a Kansas prisoner escapes in a van driven by a volunteer, investigators scramble to track down the pair; Andrea Canning likens this story to a bunch of Hollywood blockbusters rolled into one, but it's as real as it gets.

Authorities take two years and three trials to solve the shooting death of the wife of an FBI agent in the kitchen of her family's Virginia home.

An Arkansas realtor sets her daughter up with the richest guy in town, but when he mysteriously dies, she's accused of stealing his fortune; additional deaths and a web of lies ensnare the rural community, leaving a family destroyed.

John Sutton and his wife Susan are brutally attacked in their million dollar Florida home, but the motive is unknown.

John Sutton and his wife Susan are brutally attacked in their million dollar Florida home, but the motive is unknown.

After a sudden marriage creates tension between two families, a murder exposes secrets, lies and a long-buried mystery.

Kelly and Steve head to his home state to unravel the murder of a recently married Navy veteran, shot execution-style in his lakeside home; an examination of phone records could hold the key to uncovering his killer's identity.

The "Cold Justice" team tackles the disappearance of a loving mother who allegedly disappeared during a family vacation; the investigation uncovers evidence that she never left town alive.

The "Cold Justice" team investigates the mysterious death of a pregnant mother whose skull was found on a wooded mountain; with multiple suspects and conflicting stories, can they uncover the truth and get justice for her and her unborn child?

Kelly and Steve team up with the Clinton County Sheriff's Office to solve the heartbreaking cold case of a young mother who vanished, leaving only her wedding rings behind; did she walk away, or was she murdered?

Kelly and Abbey investigate the 1999 murder of a beloved churchgoing mother and grandmother, shot dead in her own home; with no known enemies, was she killed to send a cruel message to someone she loved?

Kelly and Tonya look into the murder of a hard-working mother who was stabbed and bludgeoned to death; the investigation uncovers a secret affair and a revelation as shocking as the murder itself.

Kelly and Steve join the Searcy Police Department to untangle the mystery of a popular hairstylist, murdered on the night of her thirtieth birthday; is it an old flame, a new boyfriend or someone else entirely?

Kelly and Steve investigate the mysterious murder of a devoted mother of four, found stabbed to death in her van with her wedding band on the floor; was an alleged secret affair behind the shocking crime?

The team digs into the 1983 murder of a dedicated mother of six, stabbed in an apparent carjacking; clues at the scene hint that a dangerous man from her past may be responsible.

Kelly and Steve travel to Montana to investigate the famous case of a young Indigenous woman who vanished after a night out; analyzing surveillance video and her social media posts could finally bring justice to her community.

A bar fire reveals a murder and a woman's secret addiction.

A deadly fight exposes a mother's secrets.

An elderly woman's death leads to shocking revelations about her daughter's double life.

A family is led to troubled waters as they search for justice.

A family's suspicion leads them to the truth about a father's disappearance.

A pretty blonde survives the attack that kills her husband.

A devout mother exposes the problems in her marriage and her mind.

Best friends band together after a husband's death.

When a beautiful woman's much older husband disappears under mysterious circumstances, police suspect that more than just a story has been cooked up.

The long-lost confession tapes of the man who claimed to be the Boston Strangler have been uncovered. Suppressed for decades, these exclusive tapes reignite doubts about his confession, inspiring experts to reexamine the evidence and suspects.

When a dog trainer with celebrity clientele disappears, investigators track down a suspect with the help of two witnesses.

When a dog trainer with celebrity clientele disappears, investigators track down a suspect with the help of two witnesses.

Before time runs out, detectives race to find a Little Rock, Ark., realtor who went missing after showing a house.

A community is left in shock when a Cornell student and star athlete gets caught in the middle of a homicide investigation.

The security cameras at the home of a wife and mother of three's home may hold the key to solving the mystery of her disappearance.

After the wife of a college professor and heir of an oil empire is found murdered in her South Florida home, footage from the home's security camera could hold the key to finding the killer.

Authorities take two years and three trials to solve the shooting death of the wife of an FBI agent in the kitchen of her family's Virginia home.

When a late-night party in the home of a celebrity basketball player turns deadly, a curious web of lies leads detectives on a rocky road to the truth to find justice for the unlikely victim.

Two unusual accidents that are two decades apart leave a family suspicious of a father who appears to benefit from tragedy.

A young immigrant mother is killed in a hunting accident while out with her fiancé; as police investigate, they unravel a tangle of romantic relationships, money and motives to reveal the terrifying truth of what really happened.

Found with a gunshot wound to her chest, a woman's family seeks justice for 20 years after the would-be murder suspect proclaims suicide.

Investigators following clues in a viral Tik-Tok trend begin to realize that nothing is as it seems after two bodies are discovered in the ashes of a suspicious house fire.

Detectives are led down a winding path involving an alleged government conspiracy and a citywide manhunt after a tragic car accident leaves a mother dead and her daughter in critical condition.

Detectives chase the truth when a struggling Hollywood actress and a famed music producer engage in a late-night rendezvous that takes a deadly turn.

Deadly Message; Special episode of "Cold Justice" featuring insights from Kelly Siegler and behind-the-scenes facts.

When Diana Burrow is found unresponsive, her family and police suspect her death is from natural causes until small-town whispers reveal the neighborhood criminals may be hiding a deadly secret.

A married politician's day with his mistress comes to a tragic end when she's shot to death in her driveway.

Deadly Message; Special episode of "Cold Justice" featuring insights from Kelly Siegler and behind-the-scenes facts.

When Diana Burrow is found unresponsive, her family and police suspect her death is from natural causes until small-town whispers reveal the neighborhood criminals may be hiding a deadly secret.

A determined detective befriends a Wisconsin woman to solve her boyfriend's suspicious disappearance.

When a young mother of 16-year-old twins is found dead, investigators must dig deep into the family's complicated relationship.

A young man from small town Indiana heads to Japan where he falls for a beautiful woman; then, they are caught up in one of the biggest natural disasters in history.

A family visit over the holidays ends in tragedy when a man is found dead on the kitchen floor; authorities are faced with twists and turns in the case as new details emerge.

A family visit over the holidays ends in tragedy when a man is found dead on the kitchen floor; authorities are faced with twists and turns in the case as new details emerge.

A husband comes under suspicion after the disappearance of his wife.

Police investigate whether the murder of a South Florida attorney is connected to a web of fraud, betrayal and more than $1 billion in missing money.

Against all odds, a young woman is found alive after an attack on her and a friend near Corpus Christi, Texas.

Serving a life sentence for a murder she claims she didn't commit, Teresa Kotomski talks on camera for the first time, sharing the intimate secrets of her rocky marriage and detailing what she now alleges caused her husband's painful poisoning death.

In a jailhouse interview, Traci Wolfe reveals the catalyst that sparked an uncontrollable rage and ended in her husband's gruesome death; holding nothing back, she now reflects on the crime that landed her in prison for life.

Serving a life sentence for the brutal stabbing of her own mother, Taylor Marks discusses the murder on camera for the first time ever; she claims she wasn't the mastermind behind the crime, but she knows who is.

A remorseful Pandora returns; her son Cody Henderson speaks out, revealing why he took part in a crime that landed him in prison for life and how he feels about the mother who turned on him.

Tausha Morton sits down to clarify what led to her ex-husband's death; she speaks out against the triggerman, alleging that there was never a murder conspiracy; she discusses how she feels being behind bars for life.

After spending 20 years in prison for a crime in which she claims no involvement, Lucille Duncan breaks her silence for the first time; she details the harrowing events that led to the shooting of her ex-boyfriend and her hopes of freedom.

Serving a life sentence for the murders of her father and his girlfriend, Tabitha Messina explains what happened on camera; she claims she wasn't the mastermind and shifts blame onto her convicted co-conspirator.

Cristina Rodriguez shares her experience watching her then-lover beat her boyfriend to death, and how it felt when he testified against her; a second convicted killer reveals his side of the story with new details.

Speaking on camera for the first time, Cameo Clines revisits the deadly Texas crime spree born from a toxic romance; from behind bars, he offers a rare look into the events that led to two murders and shares his hopes for redemption.

Serving a 60-year prison sentence, Rebecca Keller reveals new details about the night she stabbed her then-girlfriend's mother more than 70 times; she opens up about her regrets and why she thinks the crime has taken place.

Convicted of killing two taxi drivers, Chaz Blackshear returns nine years later to share new details in what led to a brutal double murder; his accomplice and then-girlfriend, Danielle Hudson, reveals her role in the crimes for the first time.

Morgan Fox, a young mother, is shot dead outside her home in North Canton, Ohio; in the search for her killer, investigators discover a toxic workplace, a twisted obsession, and a killer relationship.

A veteran cop falls for a beloved grandma he hopes to spend the rest of his life with, but when a home cooked meal sends them both racing to the hospital... this granny's gravy, and her sordid past, are brought under scrutiny.

Convicted of killing two taxi drivers, Chaz Blackshear returns nine years later to share new details in what led to a brutal double murder; his accomplice and then-girlfriend, Danielle Hudson, reveals her role in the crimes for the first time.

Morgan Fox, a young mother, is shot dead outside her home in North Canton, Ohio; in the search for her killer, investigators discover a toxic workplace, a twisted obsession, and a killer relationship.

A veteran cop falls for a beloved grandma he hopes to spend the rest of his life with, but when a home cooked meal sends them both racing to the hospital... this granny's gravy, and her sordid past, are brought under scrutiny.

When Diana Burrow is found unresponsive, her family and police suspect her death is from natural causes until small-town whispers reveal the neighborhood criminals may be hiding a deadly secret.

After former police officer is executed in his own home, police rely on his wife's testimony to bring the murderer to justice.

The police determine if a marriage that ended in flames was an accident or an act of revenge.

Details expose how the Gucci family was undone by jealousy, backstabbing, and, ultimately, an act of murder; insiders close to the fashion empire speak out about the murder of a prominent family member.

Details expose how the Gucci family was undone by jealousy, backstabbing, and, ultimately, an act of murder; insiders close to the fashion empire speak out about the murder of a prominent family member.

The five-year investigation into the death of a retired corrections officer, who was killed by antifreeze poisoning, reveals multiple suspects.

When a man goes missing, the search leads police to his girlfriend and a host of secrets about their past.

A young woman's reconnection with a childhood crush seems like a fairy tale story in the making, but her newfound happiness may be destroyed by questions about a missing man.

The case of a farmer's murder goes cold as speculation mounts about his wife's secret life and the role of a con man.

A man is abducted from his front yard; evidence from a Taser and a strange car accident lead police to an unlikely suspect.

The mystery of a corpse leads police to make an unlikely accusation about a college student and her missing husband.

An arranged marriage goes awry.

A shocking history of domestic abuse raises a surprising question about the identity of the aggressor.

The discovery of a murdered man exposes dark and disturbing secrets hidden within his family.

Three women, all with one thing in common, are driven to extremes; social media.

A brutal attack with a hammer leads to claims of abuse and reveals a shocking secret life.

A prominent scientist is bludgeoned to death with a stiletto heel.

A man is found dead on a shrimp boat; evidence leads to his past life as a drug informant.

A sudden illness ends a short marriage, but the widow could be hiding a poisonous secret.

Police search for intruders but find a suspect much closer to home when a man is beaten to death in his own home.

A contractor's death leads to another death, three arrests and a shocking motive.

A family is willing to go to any lengths to get what it wants.

A young wife finds her husband dead, but the police uncover a web of lies and murder.

Convicted of killing two taxi drivers, Chaz Blackshear returns nine years later to share new details in what led to a brutal double murder; his accomplice and then-girlfriend, Danielle Hudson, reveals her role in the crimes for the first time.

A young man reveals how cruel his mother was years after his father was tragically shot.

A veteran cop falls for a beloved grandma he hopes to spend the rest of his life with, but when a home cooked meal sends them both racing to the hospital... this granny's gravy, and her sordid past, are brought under scrutiny.

Morgan Fox, a young mother, is shot dead outside her home in North Canton, Ohio; in the search for her killer, investigators discover a toxic workplace, a twisted obsession, and a killer relationship.

A charismatic pastor's dark secrets come to light after his wife's mysterious death; the case shattered a congregats and exposes the cost of their unshakable trust.

When 18-year-old Anjelica Hadsell disappears, the investigation uncovers a sinister betrayal.

The investigation into a newlywed's murder starts with a widow, ends with a possible serial killer.

An expectant mother, Samantha Dean, is shot to death in an abandoned parking lot in Bastrop, Texas; as detectives dig deeper, they discover a diabolical plan, a shocking betrayal and a killer relationship.

In Marietta, Ga., a businessman is savagely murdered in his home; the violent and personal attack leads the detectives to look for the killer among those who knew him best.

When a 71-year-old man is found shot dead in a field, investigators suspect his killing is the result of a robbery; as new evidence surfaces, detectives develop a theory to explain his death and only a voice from the grave can prove it.

A woman's sudden death in a Detroit hotel unravels a dark web of secrets, lies and deadly coincidences that hint at something far more sinister.

The holiday season screeches to a halt when six members of the Anderson family are discovered to have been gunned down in their home; detectives work closely with family friends to track down the shocking murderer.

The Ortega family's annual Christmas Eve party is destroyed when a man dressed as Santa, wielding handguns and a homemade flame-thrower opens fire; detectives are led down a terrifying path that leads them to a sociopath.

A holiday is ruined when a couple is gunned down in their bed during what looks like a brutal home invasion, but police soon discover the true motive for the double homicide is a shocking tale of deception and betrayal.

Firefighters respond to a house fire and discover three gunshot victims inside; authorities pursue the heavily armed murderer through Christmas.

A murder in broad daylight causes the authorities to question whether it was an act of self-defense or murder.

Years after a deadly home invasion, a Texas woman faces new questions about the death of her mother.

A dead body is found in a small town in Texas and one mother may be facing death.

A small town church is shocked when one member is shot and another stands accused.

A woman is stabbed a hundred times and her body positioned in a suggestive manner. This could be a hate crime against women.

Police are able to create a composite sketch of a man burnt beyond recognition. But tracking the killer is more challenging.

By cutting a strand of a murdered man's hair into sections, forensics reveal a record of his last six months alive, and find he was frequently ingesting huge amounts of arsenic.

A bullet-riddled car, a missing driver, and no witnesses, an ambush or a random attack; the clue was something so tiny, it was measured in millionths of a meter.

Teenager is found half-naked with her throat slit; a single foreign hair found on her thumb may finger the killer.

Two women who lived in the same apartment complex were brutally murdered; the similarities of the crime scenes led police to believe they were dealing with a serial killer who hated women, and they had to find him before he struck again.

Weeks after a student vanishes, the body of an unknown female is found in the ashes of a fire 700 miles away; an alert policeman realizes the crimes could be connected.

Investigators face a growing list of suspects after a beautiful flight attendant is brutally murdered in her own home.

The assistant manager of the restaurant had been stabbed to death; police knew why he'd been killed: $8,000 was missing from the safe. As to who was responsible, his family and friends couldn't even imagine who'd want to hurt him.

Florida authorities rely on DNA evidence to try to nail the killer of a woman who was abducted from her late-night job at a convenience store, raped and strangled.

A wild fire in a secluded parking lot leads police to discover a dreadful homicide, with the suspect's image caught by security cameras.

After a prominent Arizona surgeon is found stabbed to death outside his office, investigators uncover an unlikely suspect with deep pockets and an even deeper hatred for the doctor.

Police don't have a basis for comparison to match shoe impressions, blood drops and DNA evidence from a murder scene.

A masked gunman kills two members of a family and wounds two others after they interrupt his burglary at their upscale suburban home.

Retired Detective Ken Mains teams up with an inmate on death row to expose the secrets of unknown serial killer Joseph Naso: while bringing closure to a victim's family, Ken uncovers that Naso likely killed many more women than police ever thought.

A chance encounter on the Pacific Coast Highway with a woman he first spoke to in a jail cell leads Keith Morrison to reexamine the mysterious death of Las Vegas casino magnate Ted Binion.

A chance encounter on the Pacific Coast Highway with a woman he first spoke to in a jail cell leads Keith Morrison to reexamine the mysterious death of Las Vegas casino magnate Ted Binion.

A teenage mom and her friends get caught up in a bizarre murder case.

Twenty-year-old Tiffanie Adams is eight months pregnant when she suddenly disappears; to solve the mystery, police must expose toxic relationships and deadly secrets.

When devoted young mother Sara Summer vanishes from a small Tennessee town, the investigation into her life exposes a world of romance, lies and a fatal betrayal at the hands of a man she trusted.

When a Navy officer succumbs to a mysterious illness after months at sea, nothing makes sense, until an autopsy yields a stunning revelation; all roads lead to dead ends, until they zero in on an unlikely target.

A devoted husband, military man, and father of three calls the police with a chilling confession: he's shot his wife; what first appears to be a straightforward homicide soon unravels into something far more complex.

On Christmas Eve in a quiet town, elderly couple Bob and Idella Young are brutally slain at home; a bloody glove found at the crime scene has the killer's DNA, but no one matches the sample.

Two days after Christmas a mass shooting terrorizes a small town; after killing two people and wounding many more the gunman is taken into custody; when police search for answers they uncover the worst family massacre in US history.

Just before Christmas, the body of a young mother is found strangled inside a burning car in a quiet Minneapolis suburb and detectives suspect that she was killed by someone very close to her.

Just after Christmas, a young couple is found murdered inside their Florida home; neighbors can't imagine the couple had been in the area long enough to make a mortal enemy; police uncover deeply personal details, and soon expose a deadly secret.

Colleen Stan relives what it was like to be kidnapped and imprisoned in a box, and how she escaped.

The stories of five women who suffered vile abuse while trapped inside the home of a prolific serial killer from which they eventually escaped.

The trial of Scott Peterson who was convicted for the murder of his wife and unborn child.