Detectives called the crime scene "a slaughterhouse." Matthew Hoffman killed two women and a boy in an Ohio home before kidnapping a young hostage- but why?

They were once best buddies in a small Wyoming town. But after Bob Duke's wife and young son die in a tragic fall, it changes this friendship forever.

When Sheila Davalloo becomes the ‘odd woman out' in a love triangle, she kills her rival. The case is a mystery until Sheila tries killing her husband.

Chris interviews a killer in order to understand why he and his brother kidnapped and assaulted a woman before tossing her into a river where she drowned to death.

When Michigan police find a man's headless body, it launches an investigation. When one of the teen killers confesses, he blames his friend, but can he be trusted?

Patrick Fleming, a Vietnam veteran, is found stabbed to death. During the investigation, Seattle detectives expose a crime ring led by a Gypsy con woman.

When a mother and her three daughters disappear, Detectives unravel a tale of troubled love, obsession and cold-blooded killing.

When an expectant mother is found murdered, online clues lead police to every patient's worst nightmare: a doctor who uses his skills to kill rather than cure.

When Michigan police find a man's headless body, it launches an investigation. When one of the teen killers confesses, he blames his friend, but can he be trusted?

As women go missing and neighbours complain of a stench, a Cleveland community becomes the stalking ground of a notoriously brutal serial killer.