OKLAHOMA CITY (AP) - Two more Oklahoma death row inmates have exhausted their appeals and are ready to have execution dates set once the state finishes its investigation into drug mixups during the last two lethal injections.

The Oklahoma Court of Criminal Appeals released an order Monday for stays of execution for two convicted killers - Richard Stephen Fairchild and Jeremy Alan Williams.

Oklahoma Attorney General Scott Pruitt notified the court both men had exhausted their appeals, but that execution dates shouldn't be set while a grand jury investigates how the wrong drug was delivered for the last two lethal injections.

One inmate was executed using the wrong drug in January 2015, and a second inmate was just hours away from his lethal injection in September when prison officials noticed the mistake.