David Berkowitz
Berkowitz terrorized New York City from the summer of 1976 to the summer of 1977, killing six people and wounding seven others with a .44 caliber revolver. After his shootings, he would send letters to the police, taunting them and promising more victims. When he was finally caught and indicted on eight shootings, Berkowitz claimed that he was obeying orders from his neighbor Sam’s dog, Harvey, which he said was a demon.