The three officers were West Traffic Division Police Officer Kevin Cotter, Det. Craig Marquez and Det. Travon Dixon.
They raced to Sunset Boulevard and Vine Street with no body armor and no radio last Friday when Tyler Brehm, 26, started firing at cars and people, killing a motorist and wounding two others.
Cotter was working an off-duty security shift for a nearby film shoot when he heard the shots.
Marquez and Dixon were getting coffee nearby before scheduled detective work when they were told about the shooting by frantic witnesses.
Cotter and Marquez shot and killed Brehm when he refused to drop his gun.
Police Chief Charlie Beck and Mayor Antonio Villaraigosa also commended three other Hollywood officers who handled traffic and kept bystanders safe during the incident.
City News Service contributed to this report.