After Navy electrician Michael Jacobs comes home to find his wife, Suzanne, and his 3-year-old son, Colin, murdered, San Diego police race to catch a serial killer who leaves behind an unimaginable calling card.

In Lenexa, Kansas, young women disappear from their apartments as police piece together evidence showing the terrifying crimes are connected.

A young woman is ambushed and murdered in Utah's remote Big Cottonwood Canyon. A cryptic note leaves investigators wondering if her death was just a tragic coincidence or a brutal betrayal.

When the body of a young woman if discovered on a cold winter afternoon in South Carolina, police retrace her final movements to find the killer.

Police race to find a killer after the decapitated body of a talented chef is found near Speedway, Indiana.

A woman's walk home from a Friday night out at a dance club in Lubbock, TX, ends in murder. Her naked body is discovered under a bush right next to a church on Sunday morning. As the investigation unfolds, detectives realize the path to justice relies on following the evidence to an unlikely suspect.

A cold case detective re-opens a decades old murder and promises the young woman's family their long awaited justice.

An offer of help turns deadly when a young woman and her boyfriend find themselves stranded. Investigators are soon on the trail of a ruthless serial killer.

After the lifeless body of a popular teen girl is found lying on the side of the road, police look to her cell phone records to catch her killer.

A college student's courageous battle for survival may be the key to solving a vicious double homicide.

The discovery of a woman's brutally beaten body inside an abandoned trailer is the start of a 28-year search for her killer.

On January 11, 1988, 16-year-old Theresa Burns' brutally murdered body was found by her brother, Stephen, in their home in Mishawaka, IN. The ring of a doorbell overheard during Theresa's final phone call may be the key to solving her murder.

When a young girl disappears from a quiet suburban street, it marks the beginning of a terrifying game of cat and mouse between police and her abductor.

It takes decades for investigators to follow the evidence to the long-sought-after truth behind the terrifying abduction and murder of 20-year-old Leslie Long, a young mother of three.

After leaving home with a baseball mitt on a sunny afternoon, 14-year-old Barbara Rowan disappears, never to be seen alive again. A neighbor informs the police that she left to speak with her coach, even though she wasn't signed up for a team.

After a young mother goes missing during a Fourth of July weekend, it marks the beginning of a disturbing mystery, one that will devastate a loving family and tear a small community apart.

A young girl's mother reported that her daughter had disappeared while playing outside her mother-in-law's home. Investigators immediately descended on the community, searching cornfields and creeks in the area hoping for clues.

A mother discovers that her young 8-year-old daughter has been abducted from her bedroom in the middle of the night.

Just hours after a popular teenager is reported missing, her lifeless body is discovered under a nearby bridge; police must sort through her puzzling last hours alive to bring a ruthless killer to justice.

After a beautiful young woman vanishes, investigators must sort through a series of puzzling clues to solve a deadly mystery.

A young woman's late-night call from a pay phone is transformed into the scene of a terrifying abduction.

A woman relentlessly investigates her daughter's disappearance leading police to a terrifying string of murders.

Police must retrace a teenager's last known movements if they hope to find out when and where she crossed paths with her killer.

While a predator leaves a trail of destruction in his wake, it may fall to a teenage girl to bring an end to his reign of terror.

While searching for a missing mother, police discover evidence that puts them on the trail of a deadly sexual predator.

When a senior at Ohio State University goes missing, it marks the beginning of a terrifying murder mystery.

A mother arrives home to have lunch with her teenage daughter and walks into a nightmare she will never forget.

After a young mother vanishes, her trail goes cold, then a shocking discovery reveals that history repeats itself.

When a young teacher is murdered in her home, police must rely on the eyewitness testimony of a young neighbor who saw her killer lurking outside her window.

A young mother is strangled to death during her overnight shift at an office building.

A beloved grandmother is savagely murdered during a life-and-death struggle; a family secret may be the key to bringing her heartless killer to justice.

When a hero firefighter is found savagely murdered in his own home, the trail of evidence police find takes them on a twisting and tension filled journey to justice.

When a young girl kidnapped from her bed in the middle of the night is found dead in a nearby canal, it marks the beginning of one of Salt Lake City's most notorious child murder investigations.

After a four-year-old girl finds her mother's lifeless body, police must try to unravel a puzzling mystery. A murder investigation in which they must rule out multiple solid suspects before they arrive at the unlikely killer.

After two sisters are found murdered, police find evidence painting a grim picture of the heartbreaking double homicide.

When a 16-year-old girl disappears on her way to visit friends, the police retrace her last known movements and uncover a terrifying possibility that she may have been kidnapped by an international human trafficking ring.

Police investigate a residential house fire and discover it was intentionally set to cover-up a savage murder. Had the killer managed to destroy all the evidence or was there a clue he overlooked?

When a loving mother is found gunned down just steps from her front door, police in her small town are baffled; as the investigation unfolds their initial confusion will quickly boil over into outrage.

A teenage couple out on a date are ambushed by a gun-wielding madman; the lone survivor's heartbreaking account may hold the key to bringing a cold-blooded killer to justice.

A woman and her teenage daughter are savagely murdered in their own home; police find clues at the crime scene, including a bloody bare footprint and an unharmed 3-year-old girl with a heartbreaking story.

When a young woman is found shot to death in her home, police are baffled; then a cryptic letter from a mysterious source sends the investigation down a twisting road to the truth.

A college student disappears in broad daylight after an afternoon of sunbathing at a busy lake; the mystery deepens when her wallet is found along with personal items belonging to another victim of a violent crime.

When a young woman disappears on a cold night in Breckenridge Colo., one of the state's darkest mysteries begins.

Two girls take a trip to the mall and never come home; less than 24 hours later they are found shot to death in a desolate field; investigators ask whether they were killed by someone they knew or a notorious serial killer.

Investigators look into the case of an elected community official who is found stabbed to death at his own home in Washington DC.

After years of frustration and heartbreak, investigators from three states work together to find the deadly predator responsible for three murders that are connected by one common thread.

When a young woman is savagely murdered in her own home, police must study the bloody crime scene to find the clue that will lead them to her killer.

A young woman is found bound and strangled to death on the side of a road. As police retrace her final steps, they discover she was last seen being followed by a suspicious man in a cowboy hat.

The murder of a respected health care aide sends a chill through her community. When the investigation reveals several shockingly similar crimes, police realize they've uncovered the trail of a monster.

A tourist takes a photo of vultures in Joshua Tree National Park and inadvertently discovers a gruesome homicide.

When a 15-year-old boy vanished under mysterious circumstances police feared the worst. It appeared the case had terrifying connections to a serial killer who had left a trail of bloodshed across the region.

A 14-year-old girl's mysterious runaway note raises difficult questions for police. Had she really left home on her own or had someone close to her pieced together writing from her journals to cover-up an unthinkable crime.

When a young college student is abducted from her campus parking lot it marks the beginning of a terrifying crime wave on a quiet college campus. Can police catch a serial predator before he strikes again?

After a young girl disappears from her bus stop, a nine-day search reveals that her terrifying abduction has ended in a heartbreaking homicide. As police mount a tireless search to find her killer, the community rallies together to get justice for Angie.

A burned out car and a blood-stained bedroom reveal the chilling murder of a community pillar. Will it be the smallest of clues that lead police to her heartless killer?

A young woman’s disappearance marks the beginning of a heartbreaking murder mystery. Will a clue discovered by a child be the key to catching his mother’s killer?

The abduction of a young mother from a crowded hospital parking lot is the beginning of a terrifying mystery that will torment her loved ones for decades.

When a teenager is found savagely stabbed to death in her home, police hope a trail of blood found at the crime scene will lead them to her killer.

A teenager waiting for her friends to give her a ride home from work suddenly disappears. When her friends arrive, they find terrifying evidence of her abduction.

Police must unravel a puzzling mystery when a beloved father and real estate executive is ambushed in his office.

If investigators can’t find the crack in their suspect’s seemingly air-tight alibi, a cold-blooded killer will elude justice.

After a teenager mysteriously disappears, police must determine if a secret meeting with a young man led to her murder.

After a young woman is viciously murdered, police launch a two-part investigation; one to find her killer and a second to identify his victim, “Precious” Jane Doe.

A young female soldier is found slain after a night out in Colorado Springs, CO. The investigation into her torture, molestation and murder eventually goes cold. It takes decades and advances in DNA processing to finally land her killer and bring him to justice.

Hauntingly Familiar: Investigators must overturn a shocking decision before they can solve the hauntingly familiar murder of a teenager.

Police investigate the gruesome murder of a mother and child, only to realize all the evidence indicates the killer was someone the victims knew and trusted.

A beautiful young woman turns up savagely murdered in a bar parking lot; as investigators retrace her last known steps, several suspects with possible motives come on their radar.

Police wonder if a young woman's personalized license plate, FLRT 12, makes her the target for murder or if a far more sinister plot is behind the crime.

Police find a giant sword bent in half, alongside a victim who has been savagely murdered. Investigators must sort through the details of his complicated life in order bring his killer to justice.

After a loving mother is murdered inside her own home, police focus on their two best clues -- a blood-stained hammer and a dusty footprint.

Veteran journalist Paula Zahn steps out of the studio and into the field to unravel criminal investigations, tracking the drama of each story by featuring the opinions of those closest to the case.

An unidentified woman is found callously murdered in an off-campus apartment; police have no leads on the case until her terrified neighbour shares a chilling story.

The baffling murder of a young woman leads police to two potential suspects: her new boyfriend and an obsessed stalker.

The search for the man who murdered a single mother might lead police to the perpetrator of a second brutal crime with chilling similarities.

A college student disappears, and her family launches a desperate investigation to find her; what they discover changes their lives forever.

A murdered teenager's body mysteriously turns up in the rural Iowa countryside. Will the smallest clue be the key to bringing her killer to justice?

As police try to solve a disturbing homicide, each step of the investigation reveals another layer in a spiderweb of tragedy.

A young mother vanishes, leaving behind nothing but puzzling clues and disturbing questions; a needle in the mud may reveal the truth behind her disappearance.

Paula Zahn talks to investigators, witnesses, victims' families and incarcerated criminals.

Police investigating the brutal murder of a young woman start to wonder if the ambush-style shooting that ended the victim's life resulted from a terrifying case of mistaken identity.

A homicide on May 27, 1994, and its disturbing details devastate 14-year-old Jenny Lin's loving family, leaving the tight-knit community of Castro Valley, CA, to wonder if their loved one could become the next victim.

On the morning of June 7, 1995, in Atlanta, GA, 14-year-old Nacole Smith is taking a shortcut back home, through a path in the woods, to get a forgotten project for school. Her body is discovered brutally murdered in those woods later that morning and police race to catch her killer before he can destroy another loving family.

The gruesome murder of horse ranch owner Wendi Brant traumatises her friends and family; Police focus on her estranged husband, but there are other potential suspects that muddy the investigation and throw the case into a decades-long tailspin.

The chilling murder of Lee Rotatori and the bizarre crime scene evidence police found inside her motel room mark the beginning of a heartbreaking homicide investigation with multiple victims.

When a young girl vanishes under mysterious circumstances, police must discover if she simply ran away or was actually the victim of something far more sinister.

The murder of a young college student in her off-campus apartment leads police to believe the killer may be someone she knew and the investigation into the crime threatens to tear her grieving family apart.

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A teenage girl discovers her mother's true identity, along with a telegram that says she's been murdered; her crusade to bring a killer to justice may also bring her closer to the woman she never knew.

Police must solve the murder of a young mother who was savagely strangled to death in her bed while her two young sons slept just steps away; decades of investigating reveal an unthinkable betrayal of trust.

After police find a young mother bound and murdered in her bedroom, her family challenges police to bring a heartless killer to justice.

Police try to make sense of the confusing crime scene and find the person who killed a young mother.

Police must analyze a long emotional and rage-filled 911 call to see if it was made by a distraught husband or a killer trying to cover his tracks.

A woman finds a young mother murdered following a festive New Year's celebration; police trace her last known steps to find her killer.

The police must identify the killer of a young mother based only on her frantic words in a disconnected 911 call.

The investigation of a brutal murder forces police to challenge both confessions and lies.

A young girl vanishes on a trip to the mailbox and her abandoned pink bicycle may be the key to solving the disturbing mystery.