Three cases remain before the U.S. Supreme Court. One was brought by St. Louis County prosecutors, who do not support Williams’ conviction or upcoming execution.

The Missouri Supreme Court and Gov. Mike Parson have declined to halt Tuesday’s execution of a death row inmate prosecutors say may be innocent, leaving his fate in the hands of the US Supreme Court with less than 24 hours to go before he is scheduled to die by lethal injection.

Missouri death row inmate Marcellus Williams has been executed despite admissions from a prosecutor’s office claiming his innocence. Williams had been convicted of the 1998 murder of Lisha Gayle, a former reporter for the St.