This undated file photo, downloaded from the Mexico's Attorney General's Office most wanted criminals webpage on Nov. 2, 2010, shows alleged Zeta drug cartel leader and founder Heriberto Lazcano Lazcano in an undisclosed location. The Mexican navy says on Monday, Oct. 8, 2012, Lazcano has apparently been killed in a firefight with marines in the Mexican northern border state of Coahuila.
Authorities in Mexico say that the leader of the powerful Zetas drug cartel, Heriberto Lazcano, otherwise known as The Executioner, was killed in a firefight with the Mexican Navy on Sunday.
If his death is confirmed, it would be a significant blow to the cartel and a major win for Mexican President Felipe Calderon.
Here with more details is Sylvia Longmire, author of "Cartel: The Coming Invasion of Mexico's Drug Wars."