Mexican federal authorities say they have captured Vicente Carrillo Fuentes, the alleged leader of the Juarez Cartel.
Carrillo Fuentes, also known as "El Viceroy," purportedly heads the cartel founded by his late brother, Amado Carrillo Fuentes, who was one of Mexico's most wanted criminals.
U.S. authorities have offered a reward of up to $5 million for information leading to Vicente Carrillo Fuentes' arrest or conviction.
Based in Ciudad Juarez, a city on the border with the U.S. state of Texas, the cartel fought for control of the key drug transit route against the Sinaloa cartel of Joaquin "El Chapo" Guzman.
Nearly 10,000 people died in Ciudad Juarez in the past eight years.
It was the second major drug lord arrest in as many weeks. Mexican authorities say they nabbed Hector Beltran Leyva - leader of the Beltrán Leyva Cartel - as he ate fish tacos in a seafood restaurant in central Mexico on October 1.