A military incursion on the ranch of Humberto Zorrillo was launched by the American Drug Enforcement Agency's Clandestine Laboratory Enforcement Team with backup assistance from the Mexican militia at midnight on the morning of 29 December 1992. Harry Bosch and Lt. Carlos Aguila were present.
- DEA Agent Kirth (friendly fire)
- DEA Agent Ramos
- Marvin Dance
- SJP Captain Gustavo Grena
- Osvaldo Arpis Rafaelillo