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An in-depth look at some of the world's most dangerous murderers.
S9, EP16 "David Marmolejo"
Gloria Marmolejo's attempt to stop her son's illicit relationship ended in her murder by him.
S8, EP12 "Graham Coutts"
Jane Longhurst vanishes after making a plan to go swimming with her friend's boyfriend.
S9, EP13 "Michael Ross"
Michael Bruce Ross, driven by sadistic urges, killed multiple young women in Connecticut.
S7, EP2 "John Cannan"
Experts look back on the crimes of John Cannan as he moved in and out of prison.
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.
