The trustee of Fawcett's estate has withheld money from some of the actress' beneficiaries, including her father, according to a filing by producer Craig Nevius.
The document filed last week in Santa Monica is in response to a lawsuit filed by a Fawcett's estate against him in January.
Nevius, a one-time Fawcett confidante, also claims the lawsuit against him filed by trustee Richard B Francis is a misuse of the actress' money.
The filing takes numerous swipes at Fawcett's longtime companion, actor Ryan O'Neal, and friend Alana Stewart. Both were constant figures in Fawcett's final months and worked on the documentary Farrah's Story, which aired on NBC.
Nevius sued O'Neal, Stewart and Francis over the documentary last year, claiming it didn't adhere to Fawcett's wishes and improperly cut him out of the process. His recent filing repeats an allegation that O'Neal threatened him in a phone conversation.
The filing claims Stewart misused her relationship with Fawcett to sell a book.
"I've read Mr Nevius' response to our complaint which I think contains spurious and outrageous allegations," said Howard Weitzman, who represents Fawcett's estate and O'Neal, Stewart and Francis. "I'm confident the truth will all come out during the course of the litigation."
Attorneys for Fawcett's estate claimed in their lawsuit that Nevius botched a first edit of the documentary and "embezzled hundreds of thousands of dollars" from the actress' company.