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An in-depth look at some of the world's most dangerous murderers.
S5, EP18 "Arthur Shawcross"
Arthur Shawcross, known as the 'Genesee River Killer,' was a serial killer who murdered eleven women from 1988 to 1990 in upstate New York.
S8, EP11 "Harry Jarvis"
When Carol Jarvis disappears, her husband tells friends and family that she's simply gone on a little holiday.
S7, EP10 "Zahid Zaman"
On the surface, Zahid Zaman portrayed himself as a pillar of the community, but the true story of this cult killer was deeply sinister.
S8, EP13 "Jordan Monaghan"
Jordan Monaghan kills his 24-day-old daughter Ruby on New Year's Day in January 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.