Sergeant Ron Helus was shot and killed as he responded to an active shooter at a bar.
Sergeant Helus made entry into the bar and was met by gunfire. He was transported to the hospital where he succumbed to his wounds.
Eleven people were also shot and killed and several others injured during the mass shooting. The gunman was later found dead inside the bar.
Sergeant Helus is the 48th law enforcement officer to be shot and killed this year and the eighth officer fatality from the state of California in 2018.