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An in-depth look at some of the world's most dangerous murderers.
S7, EP1 "Stephen Unwin & William McFall"
After striking up a friendship in prison for previous murders, Stephen Unwin and William McFall's release had awful consequences.
S8, EP12 "Graham Coutts"
Jane Longhurst vanishes after making a plan to go swimming with her friend's boyfriend.
S8, EP7 "Richard Biegenwald"
Over a 25-year career of murder, Richard Biegenwald kills at least six people.
S6, EP18 "Velma Barfield"
The first woman executed by lethal injection after taking six lives.
S8, EP20 "Eric Locke"
Dublin man Eric Locke refuses to accept it when Sonia Blount, a mother of one, ends their relationship.
S8, EP19 "Catherine Nevin"
Catherine Nevin reports a break-in and violent attack at her pub, which leaves her husband dead.
S8, EP18 "Charlotte and Linda Mulhall"
In March 2005, the gardaí recover human body parts from the Royal Canal in Dublin.
S8, EP17 "Colin Whelan"
When Mary Gough is found dead in her family home, her husband Colin Whelan appears shocked.
