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James Riddle Hoffa - yes, his middle name was "Riddle" - stood outside the Machus Red Fox Restaurant near Detroit on July 30, 1975, and vanished without a trace.
And now, in a field not far away, investigators are following yet another lead. They are digging up another possible grave, trying to solve the riddle of where Jimmy Hoffa went, and taxpayers again have an interest in the outcome.
Law enforcement has responded to at least 15 substantive tips on Hoffa's whereabouts since he disappeared but so far, nothing has panned out.
In Michigan, where most of the digging has been done, one tipster suggested his body was taken to a horse farm.
Some accounts put Hoffa's final resting place in the New Jersey Meadowlands, entombed in the concrete foundation of a football stadium.
Other versions have him sunk in the swamps of Florida, carted off to California, even crushed in a car and shipped overseas.
How much has all this chasing cost?
Based on just one search, as reported by The Detroit News, it is not unreasonable to estimate that law enforcement agencies, including the FBI, have spent more than $3 million trying to find Hoffa.
So do they have to do this every time there is a tip?
Maybe so, after all, it's still an open case, his family still wants answers.
"It's my fondest hope that we can give that closure not only to the Hoffa family but also to the community to stop tearing that scab off with every new lead and bring some conclusion," said Oakland County sheriff Mike Burchard.