ABC News' Jim Vojtech reports:

Although actress Farrah Fawcett passed away more than four years ago, two men are continuing to fight over her heart.

A multi-million-dollar lawsuit pitting Farah Fawcett's ex, Ryan O'Neal, against her alma mater, the University of Texas, has shed light on a purported love triangle involving O'Neal, Fawcett and her college boyfriend.

Greg Lott, 67, says he dated Fawcett while the two were University of Texas undergrads and then rekindled their romance in 1998, remaining a couple until she passed away from cancer in 2009 at the age of 62.

"Farrah Fawcett and I reunited … in a relationship, a loving, consensual, one-on-one relationship," Lott, a former University of Texas football player who now owns a car wash business in Lubbock, told ABC News.

"No other boyfriends. No other girlfriends," he said.

Lott's revelation came to light in a deposition he gave last October in the courtroom fight over an Andy Warhol painting of Fawcett that some estimate to be worth as much as $30 million.

Warhol made two portraits of the "Charlie's Angels" icon in 1980, and both could be seen hanging in her home in the 2009 NBC documentary about her battle with cancer, "Farrah's Story."

In her living trust, Fawcett left all of her artwork to the University of Texas. When the university received the late icon's art collection, it says one of those Warhols was missing.

Fawcett did not include O'Neal, her on-again, off-again boyfriend of 30 years, in her living trust but did leave $100,000 to Lott. The actress died on June 25, 2009. ABC News has not been able to confirm whether Fawcett left a will, which might have superceded her living trust.

O'Neal claims that before Fawcett died she gave the Warhol painting to him so that he could pass it on to the couple's son, Redmond. Two years ago, when the reality-TV show, "Ryan & Tatum: The O'Neals," debuted on the OWN network, a painting that looks similar to the missing Warhol was visible hanging just above O'Neal's bed.

"He is a coward and a liar," said Lott, who is expected to testify in the case that it was Fawcett's wish to bequeath all her artwork to her alma mater and that she never gave up ownership of either Warhol portrait.

Lott showed ABC News what he says are years of handwritten love notes between him and Fawcett, as well as a photo of O'Neal that Lott says the actor sent to him after Fawcett's death. The photo is inscribed with the message, "For Greg Lott, nobody wins. Peace."

While Lott says he and Fawcett kept their relationship away from the public and photographers, Fawcett and O'Neal were spotted together during her battle with cancer and right up to her death. Lott discounts their relationship and says O'Neal actually kept him from seeing Fawcett in her final days.

"He kept me from seeing the love of my life before she died," he said. "Photos don't make a relationship. I know what I had with her. He didn't have that. He blew it."

When reached for comment by ABC News, an attorney for O'Neal issued a statement calling Lott a convicted felon trying to make a profit off a relationship that he termed, "absurd and completely uncorroborated."

Lott testified in his deposition that he has been convicted twice on drug charges.

The next hearing in the court case is scheduled for November.