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Ryan O'Neal threatened to kill a producer who wouldn't give up control of Farrah Fawcett's documentary, the producer charges in new court papers, has learned exclusively.

Craig Nevius, who is being sued by O'Neal and Richard Francis on behalf of Farrah's estate, filed new court papers stating:

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"In September 2008, Ryan O'Neal contacted Mr. Nevius and wrongfully demanded that Mr. Nevius relinquish control of SBR and the Film to a producer of his choosing. When Mr. Nevius refused, Mr. O'Neal threatened to kill him."

The filing also says that Francis told Nevius that Ryan would get violent. The papers state:

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"In April 2009, Mr. Francis threatened Mr. Nevius to stay away from Ms. Fawcett under threat of physical violence, stating: '... you better not appear at Farrah's. Because you're gonna get your ass kicked in by Ryan! And I mean it!'"

Fawcett's estate has accused Nevius of embezzling and charged that he was removed from the project of Farrah's documentary for poor work.

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But Nevius has battled back viciously in court. He sued O'Neal, Alana Hamilton Stewart and Francis last year.

He also says that Stewart used Farrah for profit, to sell a book about her friend's situation.

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Farrah died June 25, 2009.