A judge accepted a plea of no contest last month which would have spared Marcellus Williams’ life, but that deal was scuttled by the Missouri Attorney General’s Office.

Williams is set to be executed Tuesday for the 1998 killing of Felicia Gayle, a crime that he has always denied any role in. His attorneys have launched multiple legal battles in an attempt to save his life.

The Supreme Court is generally unified in its ruling on death penalty cases, but Marcellus Williams' case sparked differing opinions.