Who was ‘El Mencho,’ the feared cartel leader killed in a military operation?

From CNN en Español’s Gonzalo Zegarra and Rocío Muñoz-Ledo (CNN) — Nemesio “El Mencho” Oseguera Cervantes was a feared Mexican drug lord and the leader of a ruthless cartel accused of masterminding efforts to push fentanyl into the United States. Once a police officer, Oseguera went on to become one of the world’s most wanted