When Alan Miller passed away in a US prison in the state of Alabama, witnesses saw him twitching and shivering before gasping for air.
The 59-year-old was also observed tugging at his bindings before he stopped moving. He was lying down on a stretcher.
He was just the second person to be put to death by gas in the United States.
In August 1999, Miller was found guilty of shooting three men to death in the Alabaman community of Pelham.
He was originally scheduled to be executed by lethal injection in 2022, but the effort was abandoned when medical personnel were unable to locate a vein in time for the original death warrant to expire.
Miller concluded by saying, “I didn’t do anything to be in here.”
Additionally, he begged his loved ones to “take care” of someone, although it was unclear who the person was named because a gas mask covered his face muted his voice.
The prisoner was declared deceased on Thursday at 6:38 p.m. local time.
This is the seventh execution in the US in as many weeks, and it has reignited discussions about the death sentence and whether or not certain of its applications are cruel.