Davis is set to be executed September 21 for the 1989 shooting death of a police officer in Savannah, Georgia, but his supporters say there is strong evidence supporting his claim of innocence.
No murder weapon was ever found, no DNA evidence or fingerprints tie Davis to the crime, and other witnesses have since said the murder was committed by another man -- a witness who testified against him.
In August 2010, however, a US District Court in Georgia ruled that Davis had failed to prove his innocence and denied him a new trial. The top US court turned down a subsequent appeal.
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