"This is a very close-knit community", Kuredjian said, adding that Thousand Oaks - north and west of Los Angeles - is a "pro-law-enforcement community" as well.
The unnamed gunman opened fire at the Borderline Bar and Grill around midnight on Wednesday, Nov. 7, injuring at least 11 people.
A police officer, described as a sheriff's sergeant, and the gunman are among the 13 confirmed to have died.
Dean said around 10 other people were shot and wounded.
A neighbor, Tom Hanson, told local television station KTLA that he and other neighbors knew Long "had issues".
The bar was holding a college country nights event between 9 p.m. and 2 a.m. on Wednesday night, its website states. The sheriff said the gunman has not been identified and there was no known motive for the shooting.
Less than two weeks after the Pittsburgh synagogue shooting that killed 11, another mass shooting has taken a dozen lives in California.
Hours before the shooting, he shared a flier advertising the college country night on his Instagram page, writing: "See y'all tonight!"
Sheriff's deputy speaks to a potential witness as they stand near the scene, November 8, 2018, in Thousand Oaks, Calif. where a gunman opened fire Wednesday inside a country dance bar crowded with hundreds of people.
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"It was chaos, people jumping out of windows, people hopping over gates to get out" Steinwender told KABC-TV.
The killer also deployed a smoke device, a law enforcement official told The Associated Press.
He first fired on a person working the door, then appeared to shoot at random at people inside, they said.
Helus, who died at a hospital early Thursday, is survived by his wife and son. "There are a few people we can't get a hold of, but in these situations people usually turn off their phones to be safe so I'm not gonna get too anxious".
"When he heard gunfire, he went in and that's something would expect from Ron", Kuredjian said.
Long was armed with a Glock 21, a.45-caliber created to hold 10 rounds plus one in the chamber, according to the sheriff.
Long's gun had an extended magazine on it, Dean said, which enabled it to hold more rounds and fire more shots before reloading.
Forensics officers scour the scene at the Borderline Bar & Grill after the shooting.
Tayler Whitler, 19, said she was on the dance floor with her friends nearby when she saw the gunman shooting and heard screams to "get down". "That's the stuff I'm truly going to miss", he said.