Mexico 's president described as `` one of the most important and most dangerous '' people on the country 's list of most wanted criminals . Investigators will conduct DNA tests to confirm the killing of the Zetas leader . The U.S. State Department has warned Americans in Mexico not to travel there because of a recent spike in violence against police and other security forces. Authorities have said there 's no doubt they killed Heriberto Lazcano Lazcano . The cartel chief 's body was stolen from a funeral home .
Investigators will conduct DNA tests to confirm the killing of the Zetas leader . The U.S. State Department has warned Americans in Mexico not to travel there because of a recent spike in violence against police and other security forces. Authorities have said there 's no doubt they killed Heriberto Lazcano Lazcano . The cartel chief 's body was stolen from a funeral home .