A man whose death sentence for killing a Missouri couple while robbing their home was overturned three times was scheduled to be executed on Tuesday. Carman Deck, 56, would be just the fifth U.S. inmate to be executed this year if his lethal injection goes ahead. Deck, who was from the St. Louis area, was a friend of the grandson of James and Zelma Long and knew they kept a safe in their home De Soto, about 45 miles (72 kilometers) southwest of St. Louis, according to court records.