A Mexican federal official says the Mexican army has killed the leader of the Jalisco New Generation Cartel in a military operation. MEXICO CITY (AP) — The Mexican army killed the leader of the Jalisco New Generation Cartel , Nemesio Rubén Oseguera Cervantes, “El Mencho,” on Sunday, decapitating what had become Mexico’s most powerful drug cartel and thrusting swaths of the nation into chaos. The drug lord was the Mexican government’s biggest prize yet to show the Trump administration in its