Question: which Mexican drug cartel does its member murdered John Clay Walker 
Sentence (from "Guadalajara Cartel"): The Guadalajara Cartel (Spanish: "Cártel de Guadalajara" ) was a Mexican drug cartel which was formed in the 1980s by Rafael Caro Quintero, Miguel Ángel Félix Gallardo and Ernesto Fonseca Carrillo in order to ship heroin and marijuana to the United States.
Relevant evidence: Yes