Updated

Mexican authorities say they have extradited a founding member of the brutal Zetas drug cartel who is suspected of involvement in the killing of a U.S. customs agent.

Mexico's Attorney General's Office says in a statement that Jesus Enrique Rejon Aguilar was turned over to U.S. authorities Tuesday to face drug-trafficking charges in Washington.

Rejon is identified as third in command of the Zetas, which over a decade went from being the military arm of the Gulf Cartel to having its own drug-trafficking organization.

Mexican authorities say Rejon was the leader of a Zetas cell accused of fatally shooting U.S. Immigration and Customs Enforcement agent Jaime Zapata and wounding fellow agent Victor Avila last year while they drove on a highway in San Luis Potosi state.