Heriberto Lazcano, the leader of the Zetas drug cartel, has apparently been killed in a firefight with marines in the northern border state of Coahuila, the Mexican navy has said. The navy said fingerprints taken from the body of one of two men killed in the shootout have matched the records of Lazcano, known as “El Lazca”, confirming his death. Al Jazeera’s Adam Raney reports.