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."