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An in-depth look at some of the world's most dangerous murderers.
S7, EP4 "Colin Campbell"
Thirty-two years later, a convicted killer serving life for manslaughter is found to be guilty of having committed a second murder.
S9, EP10 "Christopher McGowan"
Claire Inglis became trapped with violent offender Christopher McGowan, leading to tragedy.
S9, EP13 "Michael Ross"
Michael Bruce Ross, driven by sadistic urges, killed multiple young women in Connecticut.
S7, EP7 "David Bieber"
A fugitive from the United States murders one British police officer and tries to kill two more, sparking a nationwide search.
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.