Detective Gil Carrillo was sworn in as a Deputy Sheriff in 1971, started the first plain clothes gang unit in East Los Angeles, and continued working gangs for several years. Detective Carrillo worked as a Homicide Investigator for 21 years where he was called upon to investigate all types of murders to include serial killings as well as officer involved shootings. 

He was then transferred to the Office of the Sheriff where it was his job to illicit formation from all members of the department below the management level regarding any concerns they may have either about their particular unit of assignment or the department in general. Detective Carrillo then documented this information, after which, he and the Sheriff would return to the unit where the concerns were obtained, and address the documented concerns in person at a station meeting. While in this position, he was promoted to the rank of Sergeant, and remained.

In April 2004, he was promoted to the Rank of Lieutenant, and transferred back to the Homicide Bureau where he retired from on November 30, 2009.

Detective Carrillo has served as the Past President for the National Latino Peace Officers Association East Los Angeles Chapter, and have served on the Board of Directors for both the California Homicide Investigators Association, and The International Homicide Investigators Association.

Detective Carrillo helped capture the infamous serial killer, Richard Ramirez, who was known as the “Night Stalker” and was recently featured in the Netflix documentary Night Stalker: The Hunt for a Serial Killer.