A Texas college professor pleaded guilty to murdering his stepfather Friday at a hearing held to determine if he was competent to enter a plea. Patrick Doyle, 60, pleaded guilty but mentally ill to the May 2001 murder of Robert McGown, 79, after being offered the plea by Warren County Commonwealths Attorney Steve Wilson in Circuit Court Judge Tom Lewis court. Doyle is charged with beating McGown to death with a hammer at his stepfathers 427 Iroquois Drive residence. Doyle, who faces a maximum of 25 years in prison with the plea, emotionally told Lewis that he didnt want to put his family and the McGowns through the agony of trial. Earlier in the afternoon, Dr. David Capley, who had evaluated Doyle, said that he didnt believe that the defendant was competent enough to enter a plea. He told the judge, defense attorney Kevin West and the prosecution that Doyle was vastly psychotic and suffered from various brain diseases. Capley testified that Doyle had temporal lobe epilepsy partial seizures in the left side of his brain. He said this disorder leads to psychosis and that Doyle is a high suicide risk. He went on to say that Doyle, who was once a Baptist, had turned to Judaism and thought that Monica Lewinsky was sent to former President Bill Clinton to distract him from the Middle East peace accords, and in one instance Doyle referred to himself as Bill Clinton during an interview. On cross examination, Wilson reminded Capley that under Kentucky law, Doyle could plead guilty, but mentally ill. Capley agreed. Wilson asked why Capley had taken so long to get an interview with the accused and Capley said Doyle wouldnt see him until recently. Capley reiterated that Doyle wasnt competent to enter a plea. Doyle didnt want to relive every bloody blow and thats why hes entering the plea, Lewis said. West called several witnesses, including Doyles 26-year-old daughter, Anne Doyle, who testified she had a normal childhood and didnt notice any real changes in her fathers behavior until several years ago. Doyles mother, Edith McGown, testified that Doyle had a normal childhood, but had refused to have as much contact with her in recent months. His brother, Sam Doyle, reinforced his mothers statements. Patrick Doyle then spoke. He said he disagreed with Capleys evaluation and said the reason for the plea is that he simply didnt want his family hurt by going through a trial. Lewis then said he believed Patrick Doyle to be fully competent to enter a plea. Under terms of the plea, Patrick Doyle would not be eligible for parole for 20 years. Attorneys werent immediately available for comment. Formal sentencing is set for March 3 at 1 p.m.