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An in-depth look at some of the world's most dangerous murderers.
S9, EP4 "Graham McGill"
Mary McLaughlin's unsolved murder was finally cracked after 36 years, exposing killer Graham McGill.
S9, EP16 "David Marmolejo"
Gloria Marmolejo's attempt to stop her son's illicit relationship ended in her murder by him.
S5, EP6 "Billy Dunlop"
Billy Dunlop killed Julie Hogg in 1989 but was acquitted after two failed trials.
S7, EP14 "Paul Michael Stephani"
The story of a killer who was infamous for his whimpering confessions over the phone after each of his murders.
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.
