ATLANTA (AP) — A Georgia death row inmate's execution is set to go forth unless he gets last-minute relief from a court or the state pardons board.

Warren Lee Hill's execution is set for 7 p.m. Tuesday. Hill was serving a life sentence when he was convicted in the 1990 death of a fellow inmate.

His lawyer argues Hill is mentally disabled and shouldn't be executed. The state has argued the defense failed to prove beyond a reasonable doubt that Hill is mentally disabled.

Hill has a petition for a stay of execution pending before the U.S. Supreme Court. His lawyer has also asked the state Board of Pardons and Paroles to stay his execution and commute his sentence.

A state court judge on Monday declined to reconsider Hill's case.