HOUSTON (AP) — Attorneys for a condemned Texas killer have asked a federal judge to stop his execution, alleging the drugs he is to be injected with next week were exposed to extreme heat and smoke during a recent fire, making them unsafe. The Texas Attorney General’s Office says testing done after the fire on samples of the state’s supplies of pentobarbital, the drug used in executions, showed they “remain potent and sterile.” Jedidiah Murphy is scheduled to be executed Tuesday. He was condemned for the fatal October 2000 shooting of 80-year-old Bertie Lee Cunningham, of Garland, a Dallas suburb, during a carjacking.