Troy Davis convicted of the 1989 killing of an off-duty Savannah police officer is to be executed today September 21st. This is the fourth time in as many years that officials of the state of Georgia set an execution date.  Troy Davis wants a polygraph test in a last-ditch bid to show his innocence, Amnesty International USA said.

Davis’s execution, set for 7 p.m. local time on Wednesday. The Georgia Board of Pardons and Paroles denied him clemency on Tuesday.

“Troy is so insistent of his innocence that he is willing to take a polygraph. I think it’s a bit of a risky strategy. Polygraph tests are not the most solid type of evidence,” said Laura Moye, a spokeswoman for Amnesty.

Since his conviction, seven of nine witnesses have changed or recanted their testimony, some have said they were coerced by police to testify against Davis and some say another man committed the crime. No physical evidence linked Davis to the crime.

On Friday, more than 3,000 people gathered at the Ebenezer Baptist Church, in the heart of Martin Luther King Jr.’s former neighborhood, for a prayer vigil and protest.

This is the fourth time Mr. Davis has faced the death penalty. The state parole board granted him a stay in 2007 as he was preparing for his final hours, saying the execution should not proceed unless its members “are convinced that there is no doubt as to the guilt of the accused.” The board has since added three new members.

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