The disappearance of Teamsters union boss Jimmy Hoffa remains one of America’s most enduring mysteries. But now, nearly four decades after Hoffa vanished, his driver has claimed he knows where he is buried – and how he got there. Marvin Elkind said Hoffa was killed by a mob enforcer and buried in the foundations of the towering General Motors’ HQ in Detroit, Michigan. ‘It was his own people who did it,’ Mr Elkind said in excerpts of a new book published in the New York Post, adding Mafia member Tony Jack insinuated he was responsible.