Question: John Clay Walker was murdered by members of the Guadalajara Cartel under orders of their leader that was born in what year?
Related documents: [0]  [DOC] John Clay Walker (October 5, 1948 - January 30, 1985) was an American journalist and aspiring novelist who was abducted, tortured and murdered in Mexico by members of the Guadalajara Cartel under orders of their leader Rafael Caro Quintero. Caro Quintero suspected Walker of working as an undercover U.S. Drug Enforcement Agent (DEA) while he lived in Guadalajara, Jalisco. [END] 
[1]  [DOC] 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. He is the brother of fellow drug trafficker Miguel Caro Quintero, the founder and former leader of the extinct Sonora Cartel who remains incarcerated. [END] 
Answer: 
1952
1952