The state of Missouri has executed Marcellus Williams despite new evidence suggesting he was wrongfully convicted. Williams died by lethal injection Tuesday evening after the U.S. Supreme Court denied a stay. He was 55 years old, a devout Muslim, an imam for other incarcerated people, and a poet. The case’s prosecutor, jurors and the murder victim’s family all pleaded to stop the execution. Click here to see our coverage of his case.

Meanwhile, Texas prison officials killed Travis James Mullis on Tuesday. He is the fourth person to face lethal injection in Texas so far this year and the 16th nationwide, part of five executions scheduled across the U.S. this week.