ATLANTA – (WAOK/AJC) - Georgia’s Supreme Court has issued a stay of execution for convicted killer Warren Lee Hill. He was scheduled to die Monday night by lethal injection at the state prison in Jackson. But the court ruled it would have to decide if the state’s Administrative Procedures Act is being violated with the state’s decision to change its process for lethal injections from three drugs to the use of just one. Hill was sentenced to death for the beating death of his former cell mate, back in the early 90′s, during the time when Hill, was serving a life sentence for the murder of his teenaged girlfriend. He is also challenging the state’s law that determines whether an inmate is mentally disabled…..and whether that disqualifies him from being executed.