OKLAHOMA CITY — Oklahoma was preparing to execute a man Thursday while waiting for Republican Gov. Kevin Stitt to decide whether to spare the death row inmate’s life and accept a rare clemency recommendation from the state’s parole board. Emmanuel Littlejohn, 52, was set to die by lethal injection for his role in the 1992 shooting death of a convenience store owner during a robbery. [time-brightcove not-tgx=”true”] In six years as governor, Stitt has granted clemency only once and denied recommendations from the state’s Pardon and Parole Board in three other cases.