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Prison officials in Arizona have denied inmate Joseph Rudolph Wood was in pain during execution yesterday afternoon.
Wood gasped for around 90 minutes during his execution and eventually died almost two hours after the lethal drugs where administrated. His lawyers filed an emergency appeal while the execution was ongoing.
State Departments of Corrections Director Charles Ryan said he was assured "unequivocally" that Mr Wood was aware of what was happening, or in any pain.
A full review has been ordered into the execution of double murderer Joseph Wood, who took two hours to die after being given a lethal injection.
Arizona's Governor Jan Brewer said that while justice had been done she was concerned by how long the lethal injection procedure took.
She said: "One thing is certain, however, inmate Wood died in a lawful manner and by eyewitness and medical accounts he did not suffer.
"This is in stark comparison to the gruesome, vicious suffering that he inflicted on his two victims, and the lifetime of suffering he has caused their family."
A death row inmate "gasped and snorted" as he took two hours to die by lethal injection in the latest "botched" execution in America, Reuters reported.
Double killer Wood, 55, was given a lethal injection of drugs at 1.52pm local time but was not pronounced dead until 3.49pm, the Arizona attorney general's office said.
Prior to his execution Wood was one of six death row inmates who sued Arizona arguing secrecy surrounding the drugs used in other botched executions in Ohio and Oklahoma violated their human rights.
His death raises questions about the use of the death penalty in the US.
Latest ITV News reports
Debate across America concerns method not morality after it took almost two hours for Arizona's state killing of murderer Joseph Wood.