Rally planned for inmate Troy Davis

Troy Davis

Supporters of Troy Davis are set to gather on the steps of Georgia's Capitol to protest his execution.

The rally Tuesday night is being organized by Amnesty International. Attorneys for Davis say they will file an appeal with the U.S. Supreme Court on Tuesday, seeking a new hearing. A federal appeals court last month cleared the way for Davis be put to death for killing an off-duty Savannah police officer Mark MacPhail in 1989. His execution has already been postponed three times since 2007 and the state has yet to set a new date for him to face lethal injection.

Davis' supporters say there are lingering questions about his guilt. Amnesty International's executive director Larry Cox said the
case highlights the "systemic flaws of the death penalty."