Dan Moldea has been on the Hoffa beat since 1974. He wrote the landmark book "The Hoffa Wars" in 1978, and is the most prominent Hoffa expert in the nation. We teamed up for the most recent Fox Nation investigation. Phillip Moscato, son of mobster Pillip Moscato Sr., who says his dad told him that mob hitman Sal Sally Bugs Birguglio shot Hoffa, the body brought back to New Jersey and buried. And, Frank Copola, son of Moscato Sr.'s business parnter who says his father buried Hoffa in the dump in Jersey City, New Jersey known as "Moscato's Dump" back in 1975.

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"RIDDLE: The Podcast" accompanies the Fox Nation special, "Riddle: The Search for James R. Hoffa." In the podcast series, Fox News Anchor and Senior Correspondent Eric Shawn takes you behind the scenes of his investigation of the disappearance of the iconic labor leader, James R. Hoffa, who vanished in 1975.

The podcast interviews are with people involved in the case or who have extensive knowledge of it: Former Philadelphia Mob Boss Ralph Natale, "I Heard You Paint Houses" author Charlie Brandt, Pulitzer Prize winning former Detroit Free Press reporter David Ashenfelter, "Hoffa Wars" author and investigative journalist Dan Moldea, "The Quiet Don" author Matt Birkbeck, former Fox News producer Ed Barnes, former I.R.S. special agent Melvin Gudknecht, Father Jonathan Morris, and Fox News cameraman Scott Wilder, among others.

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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.

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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 Ralph Natale, the former mob boss of Philadelphia. Ralph is 83 years old, worked under the legendary Philadelphia crime boss Angelo Bruno, the so-called "Docile Don." He recounts how he knew Jimmy Hoffa very well and bluntly admits he knew Hoffa was going to get killed. His biography is "Last Don Standing: The Secret Life of Mob Boss Ralph Natale."

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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 Charles Brandt, Frank Sheeran's former lawyer who wrote the book "I Heard You Paint Houses." I first met Charlie with Sheeran, at Sheeran's lawyer's office in Philadelphia in 2001, where Sheeran told me how he shot Hoffa twice in the back of the head and I asked him for the directions to the house, which he rattled off as Charlie and I wrote them down. That meeting started it all. Charlie's book is the basis for the Martin Scorsese Netflix film, "The Irishman," starring Robert de Niro as Frank, Al Pacino as Jimmy Hoffa. It promises to be a giant mob movie.

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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 David Ashenfelter. David was a venerable reporter for The Detroit Free Press who covered Jimmy Hoffa and his disappearance for decades. He earned two Pulitzer prizes. The epitome of an investigative reporter if there ever was one.

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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 Dan Moldea, perhaps the nation's most prominent Hoffa expert. He started reporting on the teamsters, and Hoffa, in his early twenties. He was beaten up in the process... and in 1978 wrote the landmark book, "The Hoffa Wars: Teamsters, Rebels, Politicans and the Mob."

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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 Matt Birkbeck, an award-winning investigative journalist and author, who was a reporter for The Morning Call in northeastern Pennsylvania, which gave him a ring-side seat to the Bufalino crime family. He wrote the book about its boss, called "The Quiet Don: The Untold Story of Mafia Kingpin Russell Bufalino."

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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 Melvin Gudknecht, a former special agent in the intelligence division of the IRS. Gudknecht was part of the prosecution team that put Frank Sheeran in federal prison, and believe it or not says Sheeran, despite being an admitted mafia hitman, was one of the most honorable people he ever met.

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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 Father Jonathan Morris, long time Fox News contributor and good friend. He is the pastor of Our Lady of Carmel Church in the Bronx, New York and is also a best-selling author. Father Jonathan knows Frank Sheeran's story very well. He play's Frank's priest in the Netflix film, "The Irishman," Martin Scorsese's opus starring Robert de Niro as Frank, which tells the story of Frank's claims and what brought him to confess that he killed Jimmy Hoffa.

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