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An in-depth look at some of the world's most dangerous murderers.
S7, EP2 "John Cannan"
Experts look back on the crimes of John Cannan as he moved in and out of prison.
S8, EP13 "Jordan Monaghan"
Jordan Monaghan kills his 24-day-old daughter Ruby on New Year's Day in January 2013.
S5, EP16 "Keith Jesperson"
Keith Jesperson, known as the Smiley Face Killer, brutally killed at least eight women across five American states in the early 1990s.
S6, EP2 "Jamie Reynolds"
A 23-year-old killer murders 17-year-old former head girl Georgia Williams in 2013.
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.
