• Jake Gyllenhaal, Eminem and Miguel Gomez attend the New York premiere of 'Southpaw' for THE WRAP at AMC Loews Lincoln Square on July 20, 2015 in New York City.

Jake Gyllenhaal, Eminem and Miguel Gomez attend the New York premiere of 'Southpaw' for THE WRAP at AMC Loews Lincoln Square on July 20, 2015 in New York City. (Photo : Getty Images/Michael Loccisano)

Byron "Big Naz" Williams, 46, used to work as the bodyguard of "Rap God" rapper Marshall "Eminem" Mathers III, 43, and wrote a book about it. Recently, the former bodyguard and author talked about the rapper's only film "8 Mile" on "Murder Master Music Show."

Big Naz's book "Shady Bizzness: Life as Marshall Mathers' Body guard in an Industry of Paper Gangsters" was released on Aug. 31, 2000. "8 Mile" was released on Nov. 8, 2002.

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According to Eminem's former bodyguard, "8 Mile" was supposed to be about "Shady Bizzness." He claimed that they called him first and added that he was willing to move forward  but the Eminem camp shut it down.

Big Naz added that he tried to sit down with them, bury the hatchet and even went to Proof's funeral. He claimed to have extended an olive branch to them more than once.

Eminem and Big Naz are no longer on good terms. Before writing the "Shady Bizzness" book, the former claimed the former still owed him $6,000, which Eminem's manager Paul Rosenberg had denied.

The situation almost got violent. At the time, Big Naz confronted Eminem at his mother-in-law's home and authorities ordered the former to stay away.

"It started out as a revenge thing," Big Naz told ABC News in 2000. He then said he had moved on and the "Shady Bizzness" book was "a tale of warning for anyone who wants to live the life."

In his recent interview with "Murder Master Music Show," Big Naz revealed that Eminem's next movie involves Ron Howard and Danny DeVito. According to the former bodyguard, the movie will be based on "Shady Bizzness."  

DeVito is set to star in the 2017 comedy film "The Comedian." Among his co-stars in the film are Leslie Mann, Edie Falco, Hannibal Buress, Gilbert Gottfried, Aly Mang and Robert De Niro, who is set to open a restaurant with Italian chef Massimo Bottura in The Bronx, Town and Country Mag has learned.   

Eminem has yet to confirm Big Naz's claims about the movie. Meanwhile, here is the music video of "Lose Yourself" from the soundtrack of "8 Mile":