FILE - In this March 8, 1985, file photo, U.S. Marine Corps pallbearers carry the casket holding the body of slain U.S. Drug Enforcement agent Enrique Camarena Salazar after it arrived at North Island Naval Air Station, in San Diego. Mexican drug lord Rafael Caro Quintero was only ever sentenced in Mexico for the killing of Camarena and Mexican pilot Alfredo Zavala Avelar in 1985, but his gang apparently killed as many as six U.S. citizens in the western city of Guadalajara around the same time. (AP Photo/Lenny Ignelzi, File)