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An in-depth look at some of the world's most dangerous murderers.
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, EP16 "Joe O'Reilly"
Less than 20 minutes after dropping her children off at school, Rachel O'Reilly is murdered.
S9, EP20 "Charles Cullen"
Nurse Charles Cullen secretly killed patients for years while avoiding scrutiny.
S9, EP19 "Joel Rifkin"
A traffic stop revealed a body, exposing Joel Rifkin's deadly spree against vulnerable women.
S9, EP18 "Westley Allan Dodd"
Westley Allan Dodd's escalating predation ended after he murdered three young boys.
S9, EP17 "Emanuel Webb"
A decade-old link revealed a serial killer who kept the same M.O. after moving far away.
