Question: In which region is this crminal group based whose leader served as the right hand of Arturo Beltrán Leyva who was gunned down by the Mexican military?
Sentence (from "Edgar Valdez Villarreal"): Edgar Valdez Villarreal (born August 11, 1973) also known as La Barbie ("The Barbie"), is a Mexican American suspected drug lord and leader of the Beltrán Leyva Cartel, a criminal group based in Sinaloa.
Relevant evidence: Yes