Ralph Chapman, whose son is a colleague of Helus, told Xinhua that his son was among the officers running into the bar to respond to the shooting.

Chapman said he was very sad and worried when he heard that one officer was killed at the site, very afraid that it might be his own son.

Chapman's son was a member of the motorcade transporting Helus' body on Thursday morning.

Chapman said he has served at U.S. troops in Vietnam for two years, and that he believed PTSD should not account for the mass shooting.

Tami Teece, who was a survivor of the mass shooting in Las Vegas last year that killed 59 people and wounded more than 500 others, was among the crowd mourning the death of Helus along the road.

She, who also has PTSD, told Xinhua that the government should spend more money setting up mental hospitals for veterans to address their psychological problems.

Authorities said hundreds of people were inside the bar when the gunfire rang out. A family assistance center has been set up at 1375 E. Janss Road in Thousand Oaks.

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