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.

The Supreme Court refused to block Missouri from executing Marcellus Williams on Tuesday amid questions about the jury selection process and key evidence used in convicting him of murder in 2001. Williams,