The mystery surrounding the disappearance of Jimmy Hoffa has baffled law enforcement for half a century. The former head of the powerful Teamsters union appeared for a prearranged meeting with known members of organized crime in 1975 and was never seen again. Fifty years later, the exact location of his remains is still unknown.
What were the circumstances that led to one of the most fascinating unsolved cases in American criminal history? Click through this gallery and follow the clues.