ALABAMA has executed convicted murderer Kenneth Eugene Smith with nitrogen gas, the first time the method of capital punishment has been used in the US.
Smith, 58, lost two final appeals to the Supreme Court and one to a federal appeals court, arguing the execution was a cruel and unusual punishment.
In 2022, Alabama tried and failed to execute Smith by lethal injection.
He was convicted in 1989 of murdering a preacher’s wife, Elizabeth Sennett, in a killing-for-hire.
According to the Death Penalty Information Center, Smith is the first person to be put to death using pure nitrogen gas anywhere in the world.
Alabama and two other US states have approved the use of nitrogen hypoxia as an alternative method of execution because the drugs used in lethal injections have become more difficult to find, contributing to a fall in the use of the death penalty nationally.
Five members of the media were transported by van to Holman Correctional Facility in Atmore to witness the execution.
“Tonight Alabama causes humanity to take a step backwards,” Smith said, according to witnesses. “Thank you for supporting me. Love all of you.”
After the gas began to flow into his mask, the inmate is said to have smiled, nodded toward his family and signed “I love you”.
Witnesses observed two to four minutes of writhing and about five minutes of heavy breathing before he was pronounced dead at 20:25 local time (02:35 GMT).
Breathing nitrogen without oxygen causes cells in the body to break down and leads to death.
