ATLANTA (AP) — Georgia corrections officials have set a Sept. 21 execution date for a high-profile death row inmate who claims he's innocent of murdering a Savannah police officer.The Department of Corrections said Wednesday that Troy Anthony Davis will be executed at 7 p.m. on Sept. 21 for the 1989 murder of Savannah police officer Mark MacPhail.It marks the fourth time since 2007 state officials set a date to execute the condemned man. 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 the international anti-death penalty movement, attracting high-profile figures like former President Jimmy Carter.