Supreme Court Justice Clarence Thomas surprised court watchers on Wednesday when he made a rare intervention in court arguments -- asking a question in a case where a death row inmate is challenging his conviction and sentence.

Thomas, who is the only African-American and the only Southerner on the court, asked his rare question toward the end of arguments in a case involving a black Mississippi death row inmate, Curtis Flowers, who was tried six different times for the 1996 murders of four people in a furniture store.

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Flowers' lawyers claims a white prosecutor had a history of impermissibly using jury strikes to exclude African-Americans from the jury.

The Associated Press reported that a clear majority of the court appeared “troubled” by the actions of the prosecutor -- District Attorney Doug Evans -- in the prosecution of Flowers.

Thomas asked if Flowers’ lawyers in the case had made similar decisions, and the race of any struck jurors. Lawyer Sheri Lynn Johnson said three white jurors were excused by Flowers' lawyer.

According to The Washington Post, two of Flowers’ trials were hung, and convictions in three others were overturned because of misconduct by Evans.

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But the Mississippi Supreme Court upheld his 2010 conviction, despite Evans striking five of six black jurors, arguing that Evans had race-neutral reasons for the strikes.

Thomas' last questions in a case were in 2016, and that was his first intervention in a decade. He has said previously that he relies on the written briefs and believes his colleagues interrupt too much.

Fox News' Bill Mears and The Associated Press contributed to this report.