Suspicious JFK Deaths: CIA Colleague Suspected Bill Harvey in Mobster Murder

John Whitten, a top CIA official in 1963, had suspicions about a colleague.

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 hi…