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An in-depth look at some of the world's most dangerous murderers.
S8, EP16 "Joe O'Reilly"
Less than 20 minutes after dropping her children off at school, Rachel O'Reilly is murdered.
S8, EP3 "Steven Dean Gordon"
Steven Dean Gordon and Frank Cano murdered at least four sex workers in California between 2012 and 2013.
S6, EP4 "Stuart Campbell"
Stuart Campbell is convicted for the murder of his 15-year-old niece in 2002, even though her body has never been found.
S8, EP9 "Billy Mansfield Jr."
Billy Mansfield Jr. moved between Florida and Michigan, targeting vulnerable women and girls.
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.
