The mystery surrounding the disappearance of Jimmy Hoffa has baffled law enforcement for half a century. In 1975, the former boss of the powerful Teamsters union kept a prearranged appointment with known members of organized crime, 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 intriguing unsolved cases in US criminal history? Click through this gallery and follow the clues.