In a 7-2 ruling written by Justice Brett Kavanaugh, the court found that the prosecutor’s actions were in violation of Curtis Flowers’ rights under Constitution to receive a fair trial.

The ruling does not prevent Mr Flowers, 49, from being tried a seventh time.

Justice Kavanaugh wrote that the prosecutors struck black jurors in all six trials. They “engaged in dramatically disparate questioning of black and white prospective jurors” at Mr Flowers’ sixth trial, he added.

He said that the prosecution’s decision in the most recent trial to strike a black juror “was motivated in substantial part by discriminatory intent”.

Justice Neil Gorsuch and Justice Clarence Thomas, however, dissented.

Justice Thomas said the ruling was “manifestly incorrect.” He noted that the majority “does not dispute that the evidence was sufficient to convict Flowers or that he was tried by an impartial jury.”

The case marked the first time that Justice Thomas has asked a question during oral argument in three years.

Prosecutors in America can dismiss a certain number of prospective jurors during the selection process without giving a reason.

Some states have been accused over the decades of ensuing juries are predominantly white in trials of black defendants to help secure convictions.

Mr Flowers had been appealing his 2010 conviction, which was his sixth trial, for the murder of four people at a furniture shop where he had worked in the city of Winona in Mississippi. The jury comprised one black juror and 11 white jurors.