Gregory Green hid his past murder of his first wife and unborn baby, then in 2016 killed his second wife's four children, two by gas and two by gun, repeating his deadly violence.

Benjamin killed 11 women in Detroit, Michigan, in the space of seven months, making him one of the prolific serial killers in American history.

When two couples are murdered, years apart, the crimes don't look connected. Detectives link Edward and his life as a serial killer come to light.

The murder and rape of a Vietnamese immigrant in 2007, and how 25-year-old Kenneth Jackson's loose lips led police to uncover his identity as the killer

In May 1992, Leslie Allen Williams was arrested for assault. Once in custody, she confessed to the murders of four teenage girls

On Mother's Day 2008, Edward Covington murdered his girlfriend and her two children, then mutilated the bodies before police found him.

A convicted offender linked to multiple murders is finally caught after a covert police sting uncovers damning forensic evidence.

A missing child case unravels fast when police uncover a horrific tale of abuse and murder behind a child reported as a runaway.

A mother and daughter go missing, their bodies found but not identified. Years later, DNA uncovers the truth and leads police to Robert Honsch.

A mother poisons her family with antifreeze, killing her husband and son, until a tip sparks an investigation that exposes Diane Staudte's crimes.