HUNTSVILLE (AP) — A Texas inmate convicted in the death of a prison guard was executed Thursday night after the U.S. Supreme Court rejected his lawyers’ attempts to halt the punishment. Robert Pruett was given a lethal injection for the fatal attack on corrections officer Daniel Nagle in December 1999 at a prison southeast of San Antonio. Nagle was repeatedly stabbed with a tape-wrapped metal rod, though an autopsy showed he died from a heart attack that the assault caused. Prosecutors have said the stabbing stemmed from a dispute over a peanut butter sandwich that Pruett wanted to take into a recreation yard against prison rules. He was pronounced dead at 6:46 p.m. CDT, 29 minutes after being given the drug.