A judge in Alabama blocked the state from carrying out a scheduled lethal injection execution after the inmate said the state lost his paperwork requesting an alternative method of execution.

issued the injunction Monday, saying the state could only move forward with the execution of Alan Miller if it used nitrogen hypoxia.

Miller was scheduled to die by lethal injection on Sept.

Miller told the court that he had requested the nitrogen hypoxia method using a state form that was distributed to inmates in 2018.

Alabama has yet to finalize state regulations for carrying out executions with the nitrogen method.

Alabama is one of three states in the country that have approved nitrogen hypoxia executions, but none have yet taken place.

Miller, scheduled to be put to death by lethal injection on Sept.

22, 2022, for a workplace shooting rampage in 1999 that killed three men, says the state lost the paperwork he turned in selecting an alternate execution method.

Miller's defense team also argued there have been issues with recent executions by lethal injection, such as that of Joe Nathan James Jr., who was put to death in July