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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.
S8, EP6 "Richard Kuklinski"
Richard Kuklinski claims to have murdered over 100 people for New York and New Jersey's crime families.
S8, EP5 "Randy Kraft"
Randy Kraft, a well-spoken, well-respected computer expert...and a prolific serial killer.
S8, EP17 "Colin Whelan"
When Mary Gough is found dead in her family home, her husband Colin Whelan appears shocked.
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.