By GREG BLUESTEIN
ATLANTA (AP) - Georgia is getting ready to execute Troy Davis for the 1989 killing of an off-duty police officer, despite his insistent claim that he's innocent.
Davis is scheduled to die by injection at 7 p.m. Wednesday for the killing of Mark MacPhail, who was working as a security guard in Savannah. MacPhail was shot dead rushing to help a homeless man who was being attacked.
The pardons board on Tuesday rejected his clemency bid. His attorneys haven't ruled out one last legal appeal, but they know it's a long shot. His attorneys also say Davis will take a polygraph test if the pardons board will consider the results. It's not clear whether prisons officials would allow the test.
Prosecutors and MacPhail's family say they have no doubt Davis is guilty.