Jimmy Hoffa regarded his efforts to regain power within the Teamsters as a threat to their control of the union's pension fund. The FBI has called the report the definitive account of what agents believe happened to Hoffa. In the book "The Iceman: Confessions of a Mafia Contract Killer", Richard Kuklinski claimed to know the fate of Hoffa: his body was placed in a 50-gallon drum and set on fire for "a half hour or so," then the drum was welded shut and buried in a junkyard. Later, according to Kuklinski, an accomplice started to talk to federal authorities and there was
Jimmy Hoffa he was told that Hoffa was cremated after the murder. Sheeran also confessed to reporters that he murdered Hoffa. Blood found in the Detroit house where Sheeran claimed the murder happened was determined not to be Hoffa's. On June 16, 2006, the "Detroit Free Press" published in its entirety the so-called "Hoffex Memo", a 56-page report the FBI prepared for a January 1976 briefing on the case at FBI Headquarters in Washington. Although not claiming conclusively to establish the specifics of his disappearance, the memo records a belief that Hoffa was murdered at the behest of organized crime figures who