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."
More top news
A look ahead to the forecast for today across the UK.
People have been warned to prepare for cold weather as ice and snow is set to hit parts of the UK.
There is concern that the lack of clean water could add mean more people fall victim to the worst recorded cholera outbreak in history.