He died at a hospital. Authorities say there were multiple injuries - including one officer - after a man opened fire in Southern California bar late Wednesday. "And tonight, as I told his wife, he died a hero because he went, he went in to save lives, to save other people's lives", Dean said. The identities of the other victims have not been released at this time.
The police officer was injured when he arrived at the scene with colleagues and "attempted to neutralize the threat", Ventura County Sheriff's Office Capt. Garo Kuredjian said.
President Trump tweeted on Thursday morning to say he been briefed on the shooting, describing it as "terrible", and praising the bravery of the police officers involved.
After a mass shooting in California killed 13, some distraught relatives tried to locate missing loved ones with the help of technology.
Shootings of any kind are extremely rare in Thousand Oaks, a city of about 130,000 people about 40 miles (64 kilometers) west of Los Angeles, just across the county line.
The gunman, who is believed to be among the dead, burst into the bar around 11:20 p.m., cloaked in all black as he threw smoke bombs and began shooting at targets as young as 18 authorities and witnesses said.
When the shots started, some people smashed windows with chairs to escape, witnesses told CNN.
The Times reports that there were multiple reports of shots fired and people hit.
"Sergeant Helus served with the Ventura County Sheriff's Office for 29 years and is survived by his wife and son".
The gunman has been revealed as 28-year-old veteran Long, who used a Glock 21.45-calibre handgun with an extended magazine to carry out the mass slaughter, according to officials.
"I can't tell you much about the shooter at this point".
US President Donald Trump said on Twitter that he has been "fully briefed on the bad shooting".
"It's a horrific scene in there", Dean said.
"I heard a gunshot, I turned around and I saw him shoot a couple more times", student Teylor Whittler told KABC.
Video accessed by the AP showed law enforcement officers and vehicles speeding to the scene and people running from the bar. He told her, "I've got to go handle a call".
Speaking through tears, Mr Coffman said: "I talked to him last night, before he headed out the door".