Ryan O'Neal, who was recently diagnosed with prostate cancer, has a trial date set to determine who owns a Farrah Fawcett painting by Andy Warhol that the late actress' alma mater, the University of Texas, claim was left to them in her will but which O'Neal says is his.

The University of Texas filed a lawsuit against O'Neal last August, demanding that he turn over the painting, claiming the Charlie's Angels star bequeathed it to the school after she died.

Ryan O'Neal has filed a counter-suit against the University of Texas over an Andy Warhol napkin, RadarOnline.com is exclusively reporting.

Farrah Fawcett's alma mater, the University of Texas, filed a lawsuit against O'Neal in August, demanding that he turn over an Andy Warhol painting of the late actress he was in possession of, that the Charlie's Angels star had bequeathed to the school after she died.

EXCLUSIVE DOCUMENTS: Ryan O'Neal Files Counter-Suit Against University Of Texas

Within his lawsuit, O'Neal admits to having had a volatile relationship with Fawcett. "Ms. Fawcett and O'Neal had an extremely close, but sometimes tumultuous relationship," the court documents state. "During the last 30 years of Ms. Fawcett's life they lived together on and off again. They were never married.

It’s the lost Farrah Fawcett interview that could become evidence in the University of Texas’ legal wrangle with actor Ryan O’Neal.

Following an exclusive Star report on June 22, UT filed a lawsuit against the star in a bid to seize a paint and silk-screen portrait by Andy Warhol of the late Charlie's Angels actress.