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When 18-year-old Samantha Koenig goes missing, the FBI struggle to persuade serial killer and rapist Israel Keyes to tell them where his victims are located.

A look is taken at a Valentine's Day tragedy that struck a married couple, which left one of them murdered while the surviving spouse was left under suspicion.

A look is taken at a Valentine's Day tragedy that struck a married couple, which left one of them murdered while the surviving spouse was left under suspicion.

Authorities determine that a house fire that left a young mother dead was an accident, but questions arise when another tragedy strikes the same family.

As a family searches for a missing Virginia teenager, they have no idea that the police have found his body, but they are keeping it a secret.

Police track a gunman who was spotted fleeing after shooting a young mother to death, and they uncover a suspect with a motive they are unable to comprehend.

A killer is on the loose as detectives launch an investigation into the death of a young woman, who was discovered in a Texas lake.

A chef and cooking instructor is found shot to death at work and investigators are left baffled, but when a loved one's strange behavior draws their attention.

When an ailing man isn't seen for weeks, his loves ones confront his wife about her changing stories, and her revelation shocks the community.

A woman is shot in her vacation rental, and the hunt for her killer connects to a murdered farmer; clues point to a doting grandmother living a double life.

When a man dumps bags of human body parts in the Passaic River, the police try to identify the victim and corroborate a suspect's confession.

An idealistic Navy family is destroyed when the father is found murdered after home, and detectives uncover a dark plan born from lust and greed.

After a father in Spokane, Washington is found murdered in his vehicle, detectives work for years to catch a vicious killer fond of silencing witnesses.

When an Air Force recruiter is found murdered in a ditch outside his Ohio home, authorities follow several leads until the case culminates in a big sting.

When gunshots are heard in rural New Jersey, investigators find a father murdered and his vehicle stolen, and they must determine if this was a random act.

A local antique shop owner is killed in a seemingly random home invasion, but North Carolina police believe there is more than meets the eye.

A frantic 911 call captures a man's final moments after a brutal knife attack in his home, but their only eyewitness keeps changing her story.

Police are forced to wonder if an entrepreneur's unlikely friendship with a group of skateboarders was genuine or if the friendly man was their target.

After a quiet, horse-loving cowboy finds himself on the wrong side of a group of angry desert ranchers in California, he vanishes.

When a rebellious teen disappears on her way to a concert, clues point detectives to dark rituals deep in the forest.

When a woman drowns in the tub, the police assume it was suicide but when her husband confesses to murder two years later, they reexamine the crime scene.

After the police find an experienced outdoorsman viciously stabbed to death on a hunting trip, they work tirelessly to uncover the stunning truth.

Investigators suspect a killing is the result of a robbery; as new evidence surfaces, detectives develop a theory, and only a voice from the grave can prove it.

When a father finds his son missing and a woman dead in his apartment, he calls the police, but their investigation uncovers a plot that no one expected.

When police respond to a domestic disturbance in a Bay Area suburb, it's unclear who on scene was the intended victim.

After a college student is killed, detectives investigate a group of actors and are surprised when a new development in the case unfolds.

After a college student is killed, detectives investigate a group of actors and are surprised when a new development in the case unfolds.