Question: John Clay Walker was murdered by members of the Guadalajara Cartel under orders of their leader that was born in what year?

Context paragraphs:
She Likes It in the Morning: "She Likes It in the Morning is the title of a country music song written by Clay Walker and M. Jason Greene.  It was recorded by American singer Clay Walker on his 2007 album "Fall" album and released as the album's third and final single.

Clay Hill, London: Clay Hill is recorded as "Clayhyll" (1524), "Clayhillgate" (1636); apparently self-explanatory, 'hill with clay soil', with -"gate" which refers to gate of Enfield Chase.  However, the local name Claysmore, earlier "Clayes More Grove" (1610), is associated with the family of William "atte Cleye" (that is 'at the clayey place') (1274), "John Clay" (1420).  Clay Hill may derive from a surname rather than the word "clay".

John Clay Walker: 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.

Clay Walker discography: Clay Walker is an American country music artist.  His discography comprises nine studio albums and a greatest hits album, as well as 31 singles. Walker's first four studio albums — "Clay Walker", "If I Could Make a Living", "Hypnotize the Moon" and "Rumor Has It" — are all certified platinum by the RIAA, and his greatest hits album and "Live, Laugh, Love" are each certified gold by the RIAA.  "Clay Walker" is also certified platinum by the CRIA, while "If I Could Make a Living" and "Hypnotize the Moon" are certified gold.

Clay Walker (album): Clay Walker is the self-titled debut album of American country music singer Clay Walker.  It was released in 1993 on Giant Records and produced by James Stroud.  The album produced four singles on the "Billboard" country music charts, of which three — "What's It to You", "Live Until I Die" and "Dreaming with My Eyes Open" — reached Number One.  Respectively, these were the first, second, and fourth singles from the album.  The third single, "Where Do I Fit in the Picture", peaked at #11.  Additionally, "White Palace" peaked at #67 based on unsolicited airplay.

Juan José Esparragoza Moreno: Juan José Esparragoza Moreno (born February 3, 1949), commonly referred to by his alias El Azul (English: "The Blue One"), is a Mexican drug lord and leader of the Sinaloa Cartel, a drug trafficking organization.  Originally a member of the Dirección Federal de Seguridad (DFS) police agency, he founded the Guadalajara Cartel in the 1970s along with other drug kingpins in Mexico.  Following its disintegration in the late 1980s, he went on to lead the Juárez Cartel, and eventually settled in the Sinaloa Cartel.  He worked alongside Joaquín "El Chapo" Guzmán, once considered Mexico's most-wanted drug lord.

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.  He is the brother of fellow drug trafficker Miguel Caro Quintero, the founder and former leader of the extinct Sonora Cartel who remains incarcerated.

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.  Among the first of the Mexican drug trafficking groups to work with the Colombian cocaine mafias, the Guadalajara cartel prospered from the cocaine trade.

Jaime Zapata: Jaime Jorge Zapata (May 7, 1978 – February 15, 2011) was an Immigration and Customs Enforcement, Homeland Security Investigations Special Agent who was ambushed and murdered by the Mexican criminal group Los Zetas in San Luis Potosí, Mexico.  He was one of the two agents that were ambushed in a part of the country that is increasingly under the influence of drug violence.  Zapata's death is the second highest-profile killing of a U.S. agent in Mexico—the first one was Enrique Camarena, an undercover DEA agent who was tortured and murdered by the former Guadalajara Cartel.

Fall (Clay Walker song): "Fall", written by Clay Mills, Sonny LeMaire, and Shane Minor, is a song which has been recorded by both country music singer Clay Walker and pop music singer Kimberley Locke, both of whom are signed to Curb Records.  Both versions were released within weeks of each other in mid-2007; while Walker's version was released to country radio, Locke's was released to the adult contemporary radio format.  Walker's reached number 5 on the U.S. country singles charts, and Locke's reached Number One on the U.S. Dance charts.  Go West front man Peter Cox has recorded a version of "Fall" on his 2010 CD "The S1 Sessions".

Supporting paragraphs: John Clay Walker Rafael Caro Quintero
Answer: 1952