Marcellus Williams, the Missouri death row inmate who has maintained his innocence for nearly 24 years, is scheduled to be executed Tuesday, a day after the governor and the state Supreme Court refused to intervene.

Missouri is set Tuesday to execute Marcellus Williams, a death row inmate whose case has spurred several efforts to save his life amid doubts about the evidence presented at his 2001 murder trial and the actions of a trial lawyer in the case.

Williams, 55, is scheduled to die by lethal injection at 6pm CT on Tuesday for the murder of Lisha Gayle, a social worker and former newspaper reporter