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World's Most Evil Killers
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, EP2 "John Eric Armstrong"
In 1999 and 2000, John Eric Armstrong cruises the streets of Detroit looking for sex workers.
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, EP1 "Lester Jones"
In 2007, single mother of three Paige Birgfeld goes missing.
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.