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An in-depth look at some of the world's most dangerous murderers.
S8, EP7 "Richard Biegenwald"
Over a 25-year career of murder, Richard Biegenwald kills at least six people.
S6, EP3 "Trimaan Harry Dhillon"
A killer attacks his ex-girlfriend in a jealous frenzy and commits a brutal murder after a campaign of harassment.
S8, EP13 "Jordan Monaghan"
Jordan Monaghan kills his 24-day-old daughter Ruby on New Year's Day in January 2013.
S5, EP5 "Lonnie David Franklin"
Lonnie David Franklin Jr. is better known by the nickname Grim Sleeper.
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.