#21 – David Berkowitz
David Berkowitz had terrorized the citizens of New York City during the 1970s with his .44 caliber Bulldog revolver. Nicknamed the “.44 Caliber Killer,” he carried out six murders with the revolver in the summer of 1976. After that incident, he sent a series of bizarre letters to NYPD promising a massive killing spree.
Luckily, Berkowitz was captured in 1977 and his dream of committing a killing spree didn’t come true. He was sentenced to life imprisonment.