The Supreme Court overturned the conviction of a black death row inmate who said Texas prosecutors unfairly stacked his jury with whites, issuing a harsh rebuke to the state that executes more people than any other.

The 6-3 ruling Monday ordered a new trial for Thomas Miller-El, who challenged his conviction for the 1985 murder of a 25-year-old Dallas motel clerk. It was the second time justices reviewed the case after a lower court refused to reconsider Miller-El’s claims.