World's Most Evil Killers

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.

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

An in-depth look at notorious murderers, with each edition examining their lives to find what exactly drove the killers to commit their crimes.

An in-depth look at notorious murderers, with each ediition examining their lives to find what exactly drove the killers to commit their crimes.

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

The crimes of Florida man Edward Covington, who on Mother's Day 2008 murdered his girlfriend and her two children, then mutilated the bodies. His defence attorney argued that he was mentally unstable - but the judge rejected the argument and the killer was sentenced to death.

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