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The U.S. Supreme Court on Monday set aside an appeals court ruling that opened the door for an officer from the Baton Rouge Police Department to sue a Black Lives Matter activist over injuries he suffered in a 2016 protest.

According to the Los Angeles Times, the officer—whose name has not been released—filed suit against DeRay Mckesson, who "was in charge of the protests" and "did nothing to calm the crowd" at a protest that turned violent in 2016.

The officer was one of several at the scene of the riot who had bottles and other objects hurled at them. The officer reportedly suffered a severe head wound as has subsequently been in treatment and undergoing rigorous rehabilitation to return to health.

The officer sought in his lawsuit to identify Mckesson as being responsible for the mayhem of the event. The suit matriculated through the Louisiana courts, eventually getting to the highest court in the country.

The Supreme Court, however, declined to hear the case, leaving in place the decision by a lower court to deny the officer a decision in his favor.