Troy Davis has always maintained his innocence in the 1989 killing of Officer Mark MacPhail.

Bill Mears
CNN Supreme Court Producer

The Supreme Court has granted a condemned Georgia inmate's request that his execution be delayed as he attempts to prove his innocence.

The inmate, Troy Davis, has gained international support for his long-standing claim that he did not murder a Savannah police officer nearly two decades ago.

Justice John Paul Stevens on Monday ordered a federal judge to "receive testimony and make findings of fact as to whether evidence that could not have been obtained at trial clearly establishes petitioner's innocence."

Justices Ruth Bader Ginsburg and Stephen Breyer supported the decision. Sonia Sotomayor, who was sworn in August 8 as the newest member of the high court, did not take part in the petition.

Davis' case has had a dramatic series of ups and downs in the past year. He was granted a stay of execution by the Supreme Court two hours before he was to be put to death last fall.

A month later, the justices reversed course and allowed the execution to proceed, but a federal appeals court then issued another stay.

The high court's latest ruling means Davis will continue to sit on death row.

Stevens said the risk of putting a potentially innocent man to death "provides adequate justification" for another evidentiary hearing.

His supporters in June delivered petitions bearing about 60,000 signatures to Chatham County, Georgia, District Attorney Larry Chisolm, calling for a new trial. Chisolm is the county's first African-American district attorney. Davis is also African-American.

Davis has always maintained his innocence in the 1989 killing of Officer Mark MacPhail. Witnesses said Davis, then 19, and two others were harassing a homeless man in a Burger King restaurant parking lot when the off-duty officer arrived to help the man. Witnesses testified at trial that Davis then shot MacPhail twice and fled.

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