The US Supreme Court has rejected a final appeal against the death sentence by a man who was convicted in 1991 of killing a police officer.
Several key witnesses have recanted their evidence since the trial.
He had been granted clemency twice before, once less than Ministers shelve 42-day detention ...
Voting begins in US state of Ohio ...
Mammoth skull raised from ground ... two hours before he was due to be executed.
Meanwhile, Ohio has executed a man by lethal injection despite his claims that his obesity meant the method would be inhumane.
Davis has admitted being present at the scene of the killing of police officer Mark MacPhail in Savannah, Georgia, in 1989, but has always denied that he was the murderer.
At his trial, nine witnesses gave evidence that he was the man who shot Mr MacPhail, but most of the prosecution's witnesses have since recanted or contradicted their testimony.
Davis's lawyers also say post-trial information has emerged implicating another man as the gunman.
But on Tuesday, the US Supreme Court rejected a request by Davis for a review of the case, clearing the way for his execution.
Also on Tuesday, the state of Ohio executed Richard Cooey, a double murderer weighing 121kg (276lb).
A court rejected Cooey's claim that his obesity, and medicines he was taking, would mean a lethal injection would cause him to suffer an "agonising or excruciatingly painful" death.
(BBC)
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