The U.S. Supreme Court has refused to block the execution of Marcellus Williams, who is scheduled to be executed in Missouri despite significant doubts about his guilt. Williams, convicted in 2001 for the 1998 murder of Felicia Gayle, has maintained his innocence, and recent DNA evidence does not link him to the crime. Both the St. Louis County Prosecutor's Office and Gayle's family have supported clemency, citing racial bias in jury selection and prosecutorial misconduct. Missouri Governor Mike Parson and the state's Supreme Court have denied clemency and halted efforts to delay the execution. The case has drawn attention from civil rights organizations and legal experts who argue that executing Williams would be a grave injustice.