President Donald Trump has called for flags at half-staff out of respect for the victims.
"It was just semi-automatic, as many shots as he could pull, and then when it started to reload that's when we got people out of there and I didn't look back". The Ventura County Star writes about the numerous wounded; at least one of them is a police officer.
Ventura County Sheriff's Deputies responded to the incident at 99 Rolling Oaks Drive around 11:30 pm local time. He leaves behind a wife and a son.
Multiple people have been injured in a shooting at a bar in southern California, authorities said. That Sheriff's Sergeant died in the hospital.
"With over 2,500 square feet of wide open dance floor, Borderline has provided a haven for country line dancing folks of all ages equipped with pool tables", the website said.
The bar, which includes a large dance hall with a stage and a pool room along with several smaller areas for eating and drinking, is a popular hangout for students from nearby California Lutheran University.
Holden Harrah, who witnessed the shooting at the Borderline Bar & Grill, said he was inside the bar with friends, something he does every week.
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When the gunman entered, people screamed and fled to all corners of the bar, while a few people threw barstools through the windows and helped dozens to escape, witnesses said.
"It was really, really, really shocking", Whitler told KABC-TV as she stood with her father in the Borderline parking lot.
A man who says he was in the bar tells ABC news reports that he saw a man shoot into the crowd.
Helus, of Moorpark, worked for the department for 29 years.
Police told the Los Angeles Times that at least 30 shots were fired at the Borderline Bar & Grill in Thousand Oaks, about 40 miles west of Los Angeles.
"He gave it his all, and tonight, as I told his wife, he died a hero because he went in to save lives, to save other people", Dean told reporters early Thursday.