Gary Michael Heidnik an American murderer who kidnapped, tortured and raped six women who he kept as sex slaves in his basement at 3520 North Marshall Street in Philadelphia, Pennsylvania. He was convicted of killing two of the women he held captive. Heidnik was executed by the State of Pennsylvania on July 6, 1999. 

Handwritten two page letter signed twice, Gary M. Heidnik" on the top front and at the close, "Gary". 
Includes the original prison issued mailing envelope signed, "Gary M Heidnik".