Authorities have not determined a motive for Wednesday night's rampage at the Borderline Bar and Grill.
Dean said he has no doubt Helus and a California Highway Patrol officer who also was the first to respond "saved lives by going in there and engaging with the suspect". But people who knew him before deployment said he had displayed aggressive behavior previously.
Colleagues have hailed 54-year-old Helus as a hero for his actions.
Ventura County Sheriff's Office Capt. Garo Kuredjian, left, embraces chaplains with the Billy Graham Rapid Response Team as they pray near the site of Wednesday's mass shooting in Thousand Oaks, Calif., Nov. 9, 2018.
The mother of a young man who survived last year's gun massacre in Las Vegas only to be killed by another gunman in a California bar this week has made an impassioned plea for gun control. "And I don't want prayers".
"Fact is I had no reason to do it, and i just thought...f*** it, life is boring so why not?"
Last year, a country music festival in Las Vegas was the scene of the worst mass shooting in modern United States history. She was appalled that such bloodshed had come to her community.
Atlanta Falcons Make Huge Depth Move Signing Bruce Irvin
Keep an eye out for my articles covering the Falcons, Yellowjackets and other collegiate and professional teams. ET Sunday. "Yesterday it hit me a little bit", Irvin said during his introductory press conference Thursday.
"I'm super upset that it happened in our home, and I feel very bad for the families that have to go through this", said Merrill, the exhaustion evident in her eyes.
At the White House, Trump touted his efforts to fund work on PTSD among veterans.
Now, Susan Orfanos says, it's time for America to do something about gun control.
"I literally feared for myself around him", Colell said.
Typically after incidents like this week's shooting, regular Americans, politicians, and celebrities offer their "thoughts and prayers" to the victims, which has turned the phrase into a meme about inaction on gun control.
"Our officers know, when you get to a scene, and there's two of you, or even just one of you, and there's shooting going on, you go in", the sheriff said.
Long used an illegal extended magazine - created to hold extra bullets - in his attack on the Borderline Bar & Grill, about 40 miles west of Los Angeles.
Mourners cry and comfort each other during a vigil for the victims of the Thousand Oaks shooting. "Tonight Thousand Oaks takes its place with those cities, who in order to move forward will rely on hope". Fifty to 60 families gathered at the Thousand Oaks Teen Center in search of missing loved ones.
Based on time stamps, investigators say, Long posted to Instagram during the attack. Only 10 days ago, a gunman killed 11 worshippers at a synagogue in Pittsburgh.