"I've been a cop for 41 years, and I never thought I'd see the things we've seen around the country", Dean said.
He was one of the first officers through the door of the bar, according to CNN, but died at the hands of the gunman who killed 11 others. The gunman was throwing smoke grenades all over the place. The official was not authorized to discuss the investigation publicly and spoke on condition of anonymity.
It was the worst mass-shooting in US history.
Twelve people were killed, including Helus. That, it turn, closely followed the series of pipe bombs mailed to critics of President Donald Trump.
The killer was identified as 28-year-old Ian David Long, a former machine gunner and veteran of the war in Afghanistan who was interviewed by police at his home last spring after an episode of agitated behaviour that they were told might be post-traumatic stress disorder. His face was partly covered as he shot at people in the club.
Kuredjian said that shots were still being fired when sheriff's deputies arrived on the scene.
She said she had planned to go with them but stayed behind to do some schoolwork instead.
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Sergeant Helus was set to retire next year, after 29 years of service with the Ventura Country Sheriff's Department.
He later died in hospital.
The sheriff said a mental health crisis team was called at that time and concluded that Long did not need to be taken into custody.
The suspect, who has not been identified, was found dead inside the bar, Dean said. It was not immediately clear how the gunman died, Dean said.
Cody's father, Jeff Coffman, confirmed that his son had been killed in the shooting - "his name is Cody Coffman and he is my first born son", he told reporters.
Officers from at least three law-enforcement agencies combed the area around the Borderline Bar & Grill in search of the gunman who opened fire on the popular country-and-Western venue about 11:20 p.m. Wednesday night.
The shooting at the Las Vegas country music festival on October 1, 2017 left 58 people dead and more than 500 injured.
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Nick Steinwender, who is part of the university's student government, said his friends were inside the bar when the shooting started.
When Long 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. Rapid-fire gunshots could be heard as officers crouched down behind a police vehicle, weapons drawn.
"We don't know who shot anybody at this point".
Whitler said then she heard "Get up, he's coming!" and people trampled on each other to get out. "My heart goes out to his family - I can't imagine what they're going through right now".
"Within a split second, everybody yelled 'get down, ' " she said. He was accompanied by an officer from the California Highway Patrol on his way into the building.
"We're still looking for the shooter", Kuredjian said.
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