The Supreme Court is allowing Missouri to proceed with its plan to execute death row inmate Marcellus Williams.

The three cases presented to the court were his last chance at avoiding lethal injection. On Monday, Missouri Gov. Mike Parson denied clemency for Williams. The Missouri Supreme Court denied an appeal brought by St. Louis County Prosecutor Wesley Bell, who supports vacating Williams’ death sentence.

Despite protestations from the prosecutor’s office and anti-death penalty advocates, as well as calls for clemency from the victim’s family and two men famously convicted by the Missouri justice