Missouri is set to execute death row inmate Marcellus Williams on Tuesday despite prosecutors raising concerns about the possibility of his wrongful conviction.

On Monday, Williams' attorney argued that the state Supreme Court should pause the lethal injection, pointing out that a trial lawyer excluded a Black individual, whom he believed resembled the defendant, from the jury. However, the court dismissed this claim.

In its decision, the court stated, “Despite nearly a quarter century of litigation in both state and federal courts, there is no credible evidence of actual innocence or any showing of a constitutional error undermining confidence in the original judgment.” 

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Williams, who is 55, had sought clemency from Republican Governor Mike Parson, emphasizing the wishes of Gayle's family for the sentence to be reduced to life imprisonment without the possibility of parole. 

However, on Monday, the governor announced that the execution would proceed following the state Supreme Court's ruling.

Parson, who previously served as sheriff, has overseen 11 executions during his time in office and has never issued a grant of clemency.

Williams is scheduled to be executed at 6 p.m. CT on Tuesday for the 1998 stabbing death of Lisha Gayle in the St. Louis suburb of University City. He continues to maintain his innocence.