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World's Most Evil Killers
An in-depth look at some of the world's most dangerous murderers.
S7, EP16 "Heriberto Seda"
A killer who goaded police and media during his spree, Heriberto Seda claimed to kill based on his victims' star signs.
S3, EP9 "Robert Black"
Scottish serial killer Robert Black attacks four young girls between 1981 and 1986; he is sentenced to life imprisonment at HMP Maghaberry with a minimum sentence of 35 years and is linked to 13 other child murders.
S3, EP8 "Robert Lee Yates Jr."
Robert Lee Yates kills 13 prostitutes in Spokane, Wash., between 1996 and 1998 and later confesses to two other murders committed in 1975 and 1988.
S3, EP7 "Aileen Wuornos"
From November 1989 to November 1990, Aileen Wuornos kills at least six men in Florida.
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.