The U.S. Supreme Court has refused to review the appeal of a Houston man on death row for the 1992 slaying of a 9-year-old boy.
The justices offered no comment Monday in rejecting the case of 58-year-old Perry Allen Austin.
Austin was serving a 30-year term for sexual assault on a child when he pleaded guilty in April 2002 to capital murder for injecting David Kazmouz with a pain killer and then slitting the boy's throat. His skeletal remains were found in Houston in 1993. Austin confessed in 2001.
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Attorneys have argued in appeals he wasn't mentally competent to plead guilty. Prosecutors described Austin as a drug courier for a Houston street gang.
He volunteered for execution, then changed his mind a week before his scheduled punishment in 2003.