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.

A 12-year-old girl is kidnapped, following a brutal home invasion... Can police find her and her abductor before its too late?

When an 8-year-old girl vanishes on the way home from school, her family and police are sent on a tormenting search for answers. [also marked as S13:E14]

Two women are found stabbed to death three days before Christmas. A third person, a male coworker, is wounded and claims an intruder attacked them. As investigators study the evidence, it looks like the crime scene was staged.

Police try to retrace a young mother's last known movements in a desperate attempt to solve her mysterious disappearance.

When a young woman mysteriously disappears before her final shift at a Maryland hospital, her family begins a decades long search for answers.

A loving mother of three is found mysteriously shot to death just steps from her home. There are few clues at the crime scene beyond a single bullet fragment and two unknown fingerprints. Will they be enough to find the killer?

A 14-year-old girl is killed while walking her dog. When law enforcement analyzes her cell phone, it reveals a series of shocking and heartbreaking clues that ultimately lead investigators straight to her killer.

Police believe there may be a dangerous predator loose on the streets of Stockton, California, and with each attack it appears the perpetrator is growing more violent.

The discovery of a beautiful military police officer murdered in her own home sends police on a twisted journey for answers.

When a teenager is found viciously murdered, police must retrace her last steps alive to identify her killer.

An Illinois family suffers a gut-wrenching journey through the justice system after their 10-year-old daughter is found savagely murdered.

A woman suddenly disappears in Minnesota. Her husband claims she was involved with another man, and his theory is backed up by over 250 intimate emails. Investigators question if her online love affair turned deadly. Will a trail of emails lead police to a vicious killer?

A teenage girl is found murdered the night before her college dream is about to begin. The case remains a mystery until another beautiful teen is found dead a few miles away. The investigation leads police to a sadistic predator.

A cool case team reopens the investigation into the murder of 36-year-old mother Linda Robinson who was savagely murdered while her 7-year-old niece is asleep in the next room.

A young woman about to start a Hollywood career mysteriously disappears off Interstate 10.

A young woman is found murdered in a busy mall parking lot. Despite a treasure trove of evidence, detectives reach a crossroads in the investigation that could make solving the case a challenge they never imagined.

Many stories don't end when the jury delivers its verdict. Three amazing cases where the quest for justice rages on.

A teenage girl's abduction and murder leaves a small Kentucky town reeling. The investigation and its resolution shatters the close-knit community and ultimately destroys a loving family.

A hidden clue could be the key to solving the vicious murder of a Massachusetts woman. [also marked as S14:E15]

Police struggle to find a vicious killer despite having DNA evidence and a videotape of the suspect.

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.