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An in-depth look at some of the world's most dangerous murderers.
S9, EP20 "Charles Cullen"
Nurse Charles Cullen secretly killed patients for years while avoiding scrutiny.
S9, EP9 "Derek Brown"
Two missing mothers were linked when evidence tied Derek Brown to both their violent deaths.
S9, EP13 "Michael Ross"
Michael Bruce Ross, driven by sadistic urges, killed multiple young women in Connecticut.
S9, EP14 "Donald "Pee Wee" Gaskins"
"Pee Wee" Gaskins escalated from a petty criminal to a murderer after a teen went missing.
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.
