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

full_context: Document 1: 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.
Document 2: Rogaciano Alba: Rogaciano Alba Alvarez (Rogaciano Alba) is the current head of Guerrero's cattle ranching union (Guerrero cattlemen's association). He was mayor of Petatlan and is a rancher. In 2002 he was investigated for involvement in the murder of Digna Ochoa, a human rights lawyer, Zapatista supporter and anti-logging activist. He was also accused of involvement in the murder of Merejildo Torres. On May 4, 2008 his home was attacked by forty gunmen. His two sons, Alejandro and Rusbel, were killed, his daughter kidnapped and at least seven other people killed.
Document 3: Joaquín &quot;El Chapo&quot; Guzmán: Joaquín Archivaldo Guzmán Loera (] ; born on 25 December 1954 or 4 April 1957) is a Mexican drug lord who headed the Sinaloa Cartel, a criminal organization named after the Mexican Pacific coast state of Sinaloa where it was formed. Known as "El Chapo" ("Shorty", ] ) for his 168 cm stature, he became Mexico's top drug kingpin in 2003 after the arrest of his rival Osiel Cárdenas Guillén of the Gulf Cartel, and was considered the "most powerful drug trafficker in the world" by the United States Department of the Treasury.
Document 4: 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.
Document 5: Carlos Rosales Mendoza: Carlos Alberto Rosales Mendoza (12 February 1963 – 27 December 2015) was a former Mexican drug lord who founded and led an organized crime syndicate called La Familia Michoacana. He was a close friend and associate of Osiel Cárdenas Guillén, the former leader of the Gulf Cartel.
Document 6: Miguel Caro Quintero: Miguel Angel Caro Quintero is a former Mexican Drug lord born in La Noria, Badiraguato, Sinaloa, Mexico, in 1963. He is believed to have been one of the leaders of the Sonora Cartel.
Document 7: 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.
Document 8: Marco Lara Klahr: Marco Lara Klahr is a Mexican professor and journalist. He has been a journalist for 29 years focusing mainly on violence, crime and social conflicts through 15 countries. His reports have been published in different media and several have been translated into many different languages such as English, Italian, Portuguese and German. He was the founder and director of the Violence and Media project (sponsored by the European Union) in Mexican NGO INSYDE, worked as a consultant for the Open Society Justice Initiative (an operational program of the Open Society Foundations) and now works as the Director of the Media Program at the Instituto de Justicia Procesal Penal.
Document 9: Clayton Waagner: Clayton Lee Waagner (born August 25, 1956) is a convicted bank robber and anti-abortion terrorist. He was born Roger Waagner in North Dakota. He was an escaped fugitive during the spring, summer and fall of 2001 and was the FBI's 467th fugitive to be placed on the Ten Most Wanted list for carjackings, firearms violations, and bank robbery on September 21, 2001. He was placed on the United States Marshals Service Top 15 Fugitives list for sending more than 280 letters that claimed to contain anthrax, which he mailed to Planned Parenthood with return addresses of the Marshals Service and the Secret Service beginning in October 2001. He is currently in prison.
Document 10: Carlos Beltrán Leyva: Carlos Beltrán Leyva (born 1969) is an incarcerated Mexican drug lord with the Beltrán-Leyva Cartel. The cartel was created by the four Beltrán Leyva brothers: Héctor, Alfredo and Arturof Family: Adriana Karla daughter. Born in the Sinaloan countryside in the late 1960s, Carlos and his brothers worked closely with Joaquín "Chapo" Guzmán, the leader of the Sinaloa Cartel, during decades of smuggling.
Document 11: Francisco Rafael Arellano Félix: Francisco Rafael Arellano Félix (24 October 1949 – 18 October 2013) was a Mexican drug lord and former leader of the Tijuana Cartel, a drug trafficking organization. He was the oldest of seven brothers and headed the criminal organization early in the 1990s alongside them. Through his brother Benjamín, Francisco Rafael joined the Tijuana Cartel in 1989 following the arrest of Miguel Ángel Félix Gallardo, one of the most prominent drug czars in Mexico during the 1980s. When the Arellano Félix took control of the organization in the early 1990s, tensions with the rival Sinaloa Cartel prompted violent attacks and slayings from both fronts.
Document 12: Eduardo Arellano Félix: Eduardo Arellano Félix (born October 11, 1956) is a Mexican drug trafficker, brother of Benjamín, Ramón, Javier and sister Enedina, all drug traffickers. The Arellano-Félix Organization, also known as the Tijuana Cartel, has been responsible for countless murders and the smuggling of thousands of tons of marijuana, cocaine, heroin and methamphetamine for more than a decade. The DEA believes that the Arellano-Félix brothers were responsible for the numerous smuggling tunnels that were found in January 2006.
Document 13: Francisco Javier Arellano Félix: Francisco Javier Arellano Félix (born 11 December 1969), the brother of Ramón Arellano Félix, is a former Mexican drug lord and leader of the Tijuana Cartel involved in drug-smuggling operations from Mexico to the United States.
Document 14: John Walker (Medal of Honor): John Walker a/k/a Joseph Frazier, was a private with Company D, 8th U.S. Cavalry of the United States Army, who received the Medal of Honor for "gallantry in action" in combat with Apache Indians during the Apache Wars, at Red Creek, Arizona in the Arizona Territory (a few miles north of the present-day Lake Pleasant Regional Park) on September, 23, 1869. 18 Indians were reportedly killed, with more wounded. The Medal of Honor was issued on November 23, 1869. However, John Walker had an alias of "Joseph Frazier." He reportedly deserted twice, with the final desertion in 1874. John Walker was reportedly born in 1845 in Leon, Landes forest, Aquitaine, France, while "Joseph Frazier" was reportedly born in Italy. Sergeant Charles Harris and Corporal George Ferrari also received the Medal of Honor for bravery in that battle.
Document 15: 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.
ground_truth: 1952