ATLANTA (AP) — Georgia corrections officials have set an execution date for a high-profile death row inmate who claims he’s innocent of killing a Savannah police officer.

The Department of Corrections said Wednesday that Troy Anthony Davis will be executed at 7:00 p.m. EDT (2300 GMT) on Sept. 21 for the 1989 slaying of Mark MacPhail.

It marks the fourth time since 2007 that state officials have set a date to execute Davis. The order comes after the U.S. Supreme Court cleared the way for the execution by refusing to overrule a federal judge who decided Davis failed to clear his name after getting a rare chance to prove his innocence.

Davis has become a focal point for anti-death penalty activists in the U.S. and abroad, attracting supporters including former President Jimmy Carter.

Copyright 2011 The Associated Press.