The California Supreme Court has refused to block the execution of triple murderer Horace Kelly, who was found sane by a jury despite testimony that he talks gibberish and seems to believe he's in college rather than on death row.

Kelly, 38, is scheduled to be executed June 9 for killing two women and an 11-year-old boy during a six-day period in November 1984.In a 5-2 decision Tuesday, the court said it would not review an appeal by Kelly's attorney that claimed numerous legal errors and irregularities in Kelly's recent sanity trial.