Question: John Clay Walker was murdered by members of the Guadalajara Cartel under orders of their leader that was born in what year?
Sentence (from "Rafael Caro Quintero"): Rafael Caro Quintero (born October 3, 1952) is a Mexican drug trafficker who founded the now-disintegrated Guadalajara Cartel with Miguel Ángel Félix Gallardo and other drug traffickers in the 1970s.
Relevant evidence: Yes