The other deputy was released from the hospital last week.
The deputies were seated in their parked squad car when someone walked up and opened fire through the driver’s window.
The sheriff said last week that investigators are pursuing “promising leads” in the search for the gunman, who was recorded on surveillance video.
The video showed the two deputies tending to one another after they were shot in the head in following the ambush. The two deputies were shot at point-blank range while sitting inside their patrol car in Compton near a Metro station.
Villanueva said the female deputy, a 31-year-old wife and mother, and the 24-year-old male deputy, took lifesaving actions after they were shot multiple times.
Both deputies graduated from the academy 14 months ago, according to Villanueva.
The search for the gunman and potential accomplice is still underway.
As of Wednesday, the Los Angeles County Sheriff’s Department said it has raised more than $280,000 in rewards to catch the gunman and potential accomplice in the shooting. LASD also said they raised $250,000 in private donations.