Reporters at APM Reports, a division at American Public Media, highlighted Mr. Flowers’s case last year in the podcast “In the Dark.”

Reporters with the podcast poked holes in the forensic evidence prosecutors used and raised questions about an informant who said Mr. Flowers had confessed to him. In February, the podcast won a George Polk award, a prestigious journalism prize, for its work about the case.

The United States Supreme Court noted in June that Mr. Flowers’s first two convictions were reversed based on prosecutorial misconduct. His third conviction was reversed after the Mississippi Supreme Court said Mr. Evans had discriminated against black jurors during jury selection.

The fourth trial ended in a mistrial. In the four trials, held between 1997 and 2007, Mr. Evans used all 36 of his peremptory challenges to strike black potential jurors.

“The state’s actions in the first four trials necessarily inform our assessment of the state’s intent going into Flowers’s sixth trial,” Justice Brett M. Kavanaugh wrote in the majority opinion. “We cannot ignore that history.”

The fifth trial also ended in a mistrial because of a hung jury. The jury at the sixth trial, made up of one black and 11 white jurors, convicted Mr. Flowers in 2010 and sentenced him to death. The Mississippi Supreme Court had affirmed the conviction and sentence.

But Justice Kavanaugh said that Mr. Evans had violated the Constitution.

The United States Supreme Court noted that during jury selection, Mr. Evans asked black prospective jurors an average of 29 questions each, while asking the 11 white jurors who were eventually seated an average of one question each.