The bullet that killed Ventura County sheriff's Sgt. Ron Helus as he confronted the gunman in a mass shooting at a Thousand Oaks bar was fired by a California Highway Patrol officer who responded with him, authorities said Friday.
Read more on LAist.com: Ventura County Sheriff's Sergeant Who Died In Borderline Shooting Was Killed By Friendly Fire and Police Responded Immediately To Chaotic, Confusing Mass Shooting At Borderline Bar — Then Slowed.