John C. Walker was a 46-year-old undercover narcotics officer who was shot and killed while seated in his vehicle at Tucson International Airport on November 30, 1979. He had been working an undercover operation related to a cocaine case when the attack occurred, described as a sudden and violent end to his undercover work.

A 28-year-old suspect, Genaro Celaya, was arrested shortly after the shooting. Authorities recovered the flash roll of money Walker had been using for the undercover buy on Celaya, and charged him with Walker’s murder. Celaya was tried, convicted, and received a life sentence.

Did anyone who remembers Tucson airport or undercover operations from that era have information about the events leading up to the shooting?