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Sandy Berfield is killed after suffering years of harassment from a co-worker and has him jailed for violating a restraining order. Released, he sends her a bomb.

When Leesa Nascimento is killed by a shot in the head, a recently sacked co-worker, is traced after evidence is found that ties him to the murder.

Michael Lee Smith's body is found shot and dumped on the side of the road. Police are forced to sift through lies as they attempt to track down the killer.

When Marshall Dent's body is found in a shallow grave on Native American land after an anonymous phone call, authorities worry about possible gang activity.

A father sees the warning signs, but nothing prepares him for the horror to come when his son brutally murders his own five children.

A California home invasion leaves a family shattered and detectives scrambling for answers. Years later, investigators expose a deadly plot.

A dream move to Fort Worth, Texas, for a pair of new parents ends in a bloody nightmare when a twisted mind plans to commit the most terrible evil.

When tea for two becomes a murder of one, investigators from all across New York City must set aside prejudice and find justice for a few brave women.

When the young wife of a Naval Lieutenant is found beaten by the side of the road in Honolulu in 1931, the repercussions lead to murder and a sensational trial.

When Gayle Isleib is shot dead in 1996, police identify a co-worker. Evidence is found of stalking, plans to kidnap her, murder her husband and love poems to Gayle.

When Alice Hufnagle is raped and murdered in 2002, police initially question her estranged husband. But, clues eventually lead to her colleague at a local pharmacy.

Michael Lee Smith's body is found shot and dumped on the side of the road. Police are forced to sift through lies as they attempt to track down the killer.

When Marshall Dent's body is found in a shallow grave on Native American land after an anonymous phone call, authorities worry about possible gang activity.

When single dad David Heisler goes missing, clues lead detectives into the desert, but the trail stops cold. Digital forensics experts to help unravel this mystery.

When two young men are shot dead, detectives turn to digital forensics, hoping hidden data buried in the victims' cell phones will help track down the killer.

When 12-year-old Aynis Vargas dies in a seemingly random attack, investigators piece together clues from social media, cell phone data and surveillance footage.

When family man Ricky Saxton is found murdered, Investigators turn to a forensic data specialist at the FBI to help locate a missing piece of the puzzle.

Friends call cops to help them find Toni, who vanished after mixing alcohol with her bi-polar meds on a night out. But is their search about to take a dark turn.

Free spirit Jeremy is convinced that 'bad men' are out to get him. Is he suffering paranoid delusions or has he run into trouble, and where is he now.

Sixteen-year-old lifeguard Molly Bish goes missing from her work at the local pond. Has she been snatched by a predator, and where is she now.

After the death of her parents, undergrad student Leah drops out of college and hits the road, leaving a cryptic note for her friends and siblings. Where is she now.

To solve the murder of a respected young entrepreneur, Detective Dale Mason must navigate a tangled conspiracy and outwit a band of career criminals.

When a father of five is found dead on his kitchen floor, Det. James Colley must untangle a web of twisted relationships and bizarre fantasies to uncover the mystery.

The body of a promising young radio host turns up near a road in south Houston. Det. Harris takes the case, and uncovers a tragic tale of love and deceit.

A home health care aide's body floats in a rural Connecticut creek. Detective Garritt Kelly joins the investigation to bring justice to a community gripped by fear.

When tea for two becomes a murder of one, investigators from all across New York City must set aside prejudice and find justice for a few brave women.

In 2001, someone murders a father, sets his Florida home ablaze, and his sons disappear. Now, an exclusive interview uncovers the chilling truth.

A vicious Los Angeles serial killer suddenly goes silent for two decades. Police suspect he's either dead or in jail - but he was just warming up.