The shooting happened near East 81st Street and Zamora Avenue around 9:30 p.m. The deputy was transported to St. Francis Medical Center in Lynwood where he underwent surgery. The deputy's injuries and condition were unknown, though he was said to be alert and sitting up when he arrived at the hospital.
A 10-block area was shut following the shooting as authorities hunted for three possible suspects.
The deputy is reportedly based out of the Century Sheriff's Station with Operation Safe Streets, which is part of gang-suppression unit.
The cause of the shooting was not immediately known.