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An in-depth look at some of the world's most dangerous murderers.
S9, EP9 "Derek Brown"
Two missing mothers were linked when evidence tied Derek Brown to both their violent deaths.
S8, EP15 "Nicholas Burton"
In April 1997, 27-year-old Rachel McGrath is stabbed to death by an unknown attacker in a car park.
S8, EP16 "Joe O'Reilly"
Less than 20 minutes after dropping her children off at school, Rachel O'Reilly is murdered.
S7, EP17 "Mark Goudeau"
A man who terrorized Phoenix in an extensive year-long crime spree, committing nine murders with no apparent motive.
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.
