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For other uses, see Gacy (disambiguation). John Wayne Gacy Jr. (March 17, 1942 â May 10, 1994) was an American serial killer and rapist. He sexually assaulted, tortured and murdered at least 33 teenage boys and young men between 1972 and 1978 in Cook County, Illinois (a part of metropolitan Chicago). All of Gacy's known murders were committed inside his Norwood Park ranch house.