One of the suspicious deaths of JFK assassination witnesses recounted in Richard Belzer’s best-seller “Hit List” is the murder of Sam Giancana, a Mafiia boss. Giancana was shot to death in his home in suburban Chicago on June 19, 1975, apparently by someone whom he admitted to his house. Giancana was scheduled to testify to the House Select Committee on Assassinations about his knowledge of events leading the death of President Kennedy.
Defenders of the official story deride Belzer’s thesis but suspicions that JFK witnesses faced retribution reached high into the CIA. In 1978, one veteran of the clandestine service testified under oath that he thought another CIA official might have been the killer of Giancana.