World's Most Evil Killers

Mother Paige Birgfeld went missing in 2007 and her remains were found five years later. A decade on, police closed the net on a local mechanic. (S8, ep 1)

In 1973, Dawn Magyar's body was found two months after she had vanished. Twenty-eight years on, advances in forensics helped solve the case. (S8, ep 2)

In 1999 and 2000, John Eric Armstrong prowled Detroit looking for sex workers. A seemingly normal father, no one suspected he was a killer. (S8, ep 3)

Over a 25-year career of murder, Richard Biegenwald killed at least six people as he sought out ever more inventive ways of dealing death. (S8, ep 4)

For Richard Kuklinski, crime was his way of life. As a professional murderer, his unusual methods led to a disturbing nickname, The Iceman. (S8, ep 5)

When police in Colorado interrogated Richard Paul White about the murder of his friend, he began confessing to even more horrifying crimes. (S1, ep 6)

Billy Mansfield Jr murdered at least five victims, but investigators suspect the extent of his serial killing is still to be revealed. (S8, ep 7)

As well as being a well-spoken, well-respected computer expert, Randy Kraft was a serial killer suspected of killing more than 60 victims. (S8, ep 8)

Working as a truck driver, serial killer Wayne Adam Ford strangled and dismembered his victims before dumping their bodies in creeks and rivers. (S8, ep 9)

After Jarrae Estepp's body was found at a recycling centre, police discovered that her murderer, Steven Dean Gordon, had killed before. (S8, ep 10)