Mexico 's Supreme Court declares an August appeals court ruling invalid . Rafael Caro Quintero , a former cartel leader , is accused of killing a DEA agent . A Mexican judge overturned his conviction in a surprise ruling in September . In a 4-1 ruling Wednesday , Mexico 's Supreme Court declared that ruling invalid . The U.S. Treasury Department is offering a $ 5 million reward for information leading to his capture .
Mexico 's Supreme Court declares an August appeals court ruling invalid . Rafael Caro Quintero , a former cartel leader , is accused of killing a DEA agent . A Mexican judge overturned his conviction in a surprise ruling in September . The U.S. Treasury Department is offering a $ 5 million reward for information leading to his capture .