Who is ‘El Mayo’ Zambada, the Sinaloa drug cartel leader now in U.S. custody? PBS NewsHourOne of the biggest cartel busts in recent memory began with an act of betrayal CNNHow El Chapo’s son helped U.S. arrest fabled narco chief “El Mayo” ReutersHow the U.S. Captured One of Mexico’s Biggest Drug Lords The New York Times‘He’s a straight-up rancher’: Chicago twins who cooperated against Sinaloa cartel talk about arrest of ‘El Mayo’ Chicago Tribune