Most Evil: (Vampires/Cannibals) - Serial Killer Documentary 

Driven by desires and delusions, these criminals not only kill they also consume flesh and drink blood. Armin Meiwes prowled internet chat rooms, hunting for a “dinner guest”. Delusions told Richard Chase that he must drink blood. Andrei Chikatilo's childhood fuelled a psychotic mind, making him the worst killer in the Soviet Union history. Rod Ferrell twisted fantasy of being a vampire claimed two lives.

Richard Trenton Chase

Armin Meiwes

Andrei Chikatilo

Rod Ferrell

Jeffrey Dahmer