The Assassination of Fausto Alarcon occurred in 2015 when CIA assassin Alejandro Gillick traveled solo into Mexico and assassinated the Sonora Cartel's number-three lieutenant Fausto Alarcon at his mansion.
Alarcon had previously murdered Gillick's wife and daughter during Gillick's service as a prosecutor in Ciudad Juarez, leaving Gillick with a strong desire for vengeance. In 2015, the CIA and FBI launched a joint operation against the Sonora Cartel after discovering the bodies of 42 murdered immigrants at a cartel safehouse in Arizona. The operation ostensibly aimed to take down the cartel's chief of operations in the United States, Manuel Diaz, but the CIA secretly intended to create enough trouble for Diaz to be recalled to Mexico by his boss Fausto Alarcon, whom Gillick - now a CIA assassin - would eliminate. After the 2015 Nogales tunnel raid, Gillick took the Sonora state policeman Silvio Hernandez captive and forced him to apprehend Manuel Diaz as he drove to a meeting with Alarcon. Gillick then executed Hernandez and forced Diaz to drive him the rest of the way, using him to get into Alarcon's mansion before killing Diaz and two cartel guards. Gillick ambushed Alarcon and his family as they ate dinner, and he confronted Alarcon over his murder of his family before shooting Alarcon's wife and two young boys. After a few moments, Gillick finally executed Alarcon. On his return to the United States, Gillick forced FBI agent Kate Macer to sign a statement attesting that the entire operation was legal.