A TRIPLE murderer has been executed using the controversial nitrogen gas method.
Alan Eugene Miller, 59, took eight minutes to die after a previous attempt to execute him by lethal injection failed in 2022.
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It is the second time the method that has generated debate about its humaneness has been used in the US.
Miller was pronounced dead at 6:38 p.m. local time at a south Alabama prison.
He shook and trembled on the gurney for about two minutes with his body at times pulling against the restraints.
That was followed by about six minutes of periodic gulping breaths before he became still.
Miller was convicted of killing three men Lee Holdbrooks, Christopher Scott Yancy and Terry Jarvis in 1999.
