David Berkowitz aka The Son Of Sam .44 caliber serial killer who from 1976 through the summer of 1977 terrorized New York City killing six people and wounding seven others before his capture in July 1977.
Original angry typed letter numbered #006, dated September 14.
He has written below the close, "Stop reading this letter you bastard!"
Includes the original prison issued envelope postmarked September 17, 1979.
Hand signed, "David Berkowitz 78-A-1976."