Watch the two-hour special, "Riddle: The Search for James R. Hoffa," on Fox Nation. Fox Nation is a streaming subscription service you can access from your phone, computer and select TV devices. We've created a members-only destination for Fox News' most passionate and loyal fans featuring exclusive content, exclusive experiences and exclusive access.

In this episode you'll hear from Ed Barnes, the former Fox News producer who worked with me on our Hoffa investigation. Ed was a noted Time magazine correspondent for decades who also was an organized crime investigator for New York State, probing unions, the mob, and as it turned out... Frank Sheeran. He has a new motive for Hoffa's killing and where his body was dumped.Learn more about your ad choices. Visit megaphone.fm/adchoices