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An in-depth look at some of the world's most dangerous murderers.
S6, EP18 "Velma Barfield"
The first woman executed by lethal injection after taking six lives.
S8, EP3 "Steven Dean Gordon"
Steven Dean Gordon and Frank Cano murdered at least four sex workers in California between 2012 and 2013.
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.
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.
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.
