When a beloved elderly couple is stabbed over 60 times each in their bed, local law enforcement work with the FBI to track down a twisted killer. The gruesome details shock a quiet town, while the investigation sparks a rift within the victims’ families.

When a well-known local cabby, famous for his generosity, is found shot to death in his car in Peekskill, NY, the whole city wonders how this happened. The Peekskill police force and a Westchester County’s dogged prosecutor deploy every resource available to track a killer. And within 48-hours, their rapid-fire investigation uncovers a treacherous plot hatched in a deadly love affair.

On an evening in March of 1990, a knock comes at the door of Donna Willard's Philadelphia residence, and she finds herself face-to-face with a hooded gunman. He shoots Donna twice, killing her instantly, as her twelve-year-old son witnesses the murder from the peak of the stairs. For months, the hunt for her killer leads investigators on a maddening series of dead ends.

December 23, 1981, is supposed to be a happy day for Roxann Jeeves and her son, Kristopher. It's the boy's fifth birthday and they have plans to tour a candy factory. Instead, the day ends in unthinkable tragedy. Mother and son are brutally murdered together in a field outside Dallas, Texas. Their killer flees the scene and the investigation ultimately goes cold, but the killer leaves evidence that leads Detective Larry Forsyth on an epic 20-year hunt.

The disappearance of a 21-year-old sparks a massive mobilization of law enforcement to delve into the world of digital forensics.

It's late as 26-year-old student Tracey Schoettlin finishes her serving shift at a restaurant in downtown Birmingham, Alabama. She clocks out but never makes it home. The next day, her body is found beneath a bridge with 19 stab wounds, igniting a panic throughout the city and in the media. Investigators have no credible leads and the case goes cold. Then eight months later, a man shows up and reports to police his mystical visions from God about the brutal murder.

Las Vegas police hunt for the monster who raped and murdered a high school sophomore before he strikes again.

In Pensacola, Fla., a beloved barber is gunned down in his shop in broad daylight; DNA left at the crime scene may hold the answer to solving this murder mystery.

Penske Racing chef Cindy Albrecht goes missing from her home near the Indianapolis Motor Speedway in Speedway, Ind., then her headless body is later found by deer hunters.

A young father is gunned down right outside his mother’s home, and the murder is captured on security cameras. Investigators analyze surveillance video and hours of recorded calls to uncover a murder plot that threatens the entire justice system. But before the case goes to trial, prosecutors get word that the savvy killer ordered a hit against them. Now, they too, are caught in the crosshairs of danger.

There’s no pain like the loss of a young, innocent life. When a 14-year-old’s murder goes unsolved for decades, it festers into a wound that never heals. The family had long since given up hope. But everything changed when a cold case detective made it his mission to find closure for the small town that’d been plagued by questions and distrust for over 30 years.

Anna-Sigga Nicolazzi meets with the detective and prosecutor who took on the case of Karen Ann Watson, a wife and mother who was brutally stabbed to death in 1987; nearly 30 years later, they track down a killer who thinks he got away with murder.

Armed with homemade bombs, a group of masked gunmen ambush a family in the middle of the night, and murder a teenage daughter and her mom. The family’s tragedy is worsened when they believe that one of their own loved ones was behind the double homicide. It would take 30 years and an eager state trooper to bring the killer to justice.

The innocence of the quiet, rural town of Miles City, Montana is shattered when a doting father of two and loving husband, Marty Etchemendy, disappears after a local football game. The Sheriff and local volunteers scour the dusty countryside for any sign of the missing father. The trail leads detectives out of Montana on a life-and-death chase spanning over 150 miles. Investigators hold on hard to hope, but will the intense manhunt for a hostage turn into a search and recovery?

Two murders on Long Island, New York, set off a multi-county manhunt.

A simple break in routine leads to the discovery of a murdered grandfather and a missing child. Investigators must contend with a devious killer who's taken pains to cover their tracks to unravel this tragic tale of lies and betrayal.

Diana Duve had it all: great friends, supportive family, a fulfilling career, and a charismatic, successful boyfriend. But when she mysteriously goes missing, the resulting investigation unearths a past riddled with vitriol and violence. They discover a wake of victims and a heinous escalation of abuse. The prosecution knows they need to expose this wolf in sheep’s clothing before he can kill again.

When 12-year-old Naomi Jones goes missing, her mother sounds the alarm, triggering a massive search effort. But when they discover her body a few miles from her home, a team of investigators sets out to find the heartless killer who took her life.

Two generations of a family endure the tragedy of big city gun violence.

A 19-year-old convenience store clerk vanishes in Sheridan, Wyo.; a gruesome discovery seems to point police to a cold-blooded killer.