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.