Maniac Cop is a 1988 action/horror film directed by William Lustig and written by Larry Cohen. The film spawned two sequels, Maniac Cop 2 (1990) and Maniac Cop III: Badge of Silence (1993).
Innocent people are being brutally murdered on the streets of New York City by a uniformed police officer. As the death toll rises, Detective Frank McCrae heads the investigation. Jack Forrest, a young cop, finds himself under arrest as the chief suspect. He and his girlfriend Theresa, along with McCrae then set out to solve the mystery before the Maniac Cop strikes again.
Cameos are made by William Lustig, and Sam Raimi.
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Links: Wikipedia Maniac Cop 2 Maniac Cop 3