Death Row inmate Alan Miller could be executed in Alabama next week using a new, untried method that forces the prisoner to breathe only nitrogen.
James Houts, a deputy state attorney general, told a federal judge that it is "very likely" nitrogen hypoxia will be available for the execution of Alan Miller that is due to take place next week.
Although the method of execution was approved by the state of Alabama in 2018, it has never been used or tested.
It would cause death by forcing the inmate to breathe only nitrogen, starving them of the oxygen required to maintain bodily functions.
Miller was convicted of murdering three men in 1999 near Birmingham, Alabama.
His execution date is currently set to be carried out on 22 September by lethal injection, however, he is attempting to get this blocked.
The convicted murderer has requested the execution method used is nitrogen hypoxia rather than lethal injection due to his fear of needles.
During a court hearing on Monday, US District Judge R Austin Huffaker Jr asked if Alabama was in a position to carry out executions using nitrogen hypoxia.
According to Mr Houts, the method should be available as soon as next week, and officials are currently finalising a protocol of how the procedure would work.
The final decision on when the new execution method will be used will fall on Corrections Commissioner John Hamm to decide.