Since his 2001 escape from prison, Guzmán had wanted to control the Ciudad Juárez crossing points, which were in the hands of the Carrillo Fuentes family of the Juárez Cartel. Despite a high degree of mistrust between the two organizations, the Sinaloa and Juárez cartels had a working agreement at the time. Guzmán convened a meeting in Monterrey with Ismael Zambada García ("El Mayo"), Juan José Esparragoza Moreno ("El Azul") and Arturo Beltrán Leyva. In this meeting, they discussed killing Rodolfo Carrillo Fuentes, who was in charge of the Juárez Cartel at the time. On 11 September 2004, Rodolfo, his wife and two young children were visiting a Culiacán shopping mall. While leaving the mall, escorted by police commander Pedro Pérez López, the family was ambushed by members of Los Negros, assassins for the Sinaloa Cartel. Rodolfo and his wife were killed; the policeman survived.