The Supreme Court agreed on Monday to rule on a Louisiana dispute that could be an important test of prosecutorial immunity in a death penalty case.

In Connick v. Thompson, the 5th U.S. Circuit Court of Appeals affirmed a lower court verdict that awarded accused murderer John Thompson $14 million for the district attorney’s failure to train its lawyers about so-called Brady violations, a failure that led to his wrongful conviction and death sentence in 1985.