The first responder to the worst mass shooting in modern US history has spoken about his experience for the first time.
Earlier this month, 64-year-old Paddock rained bullets on the Route 91 Harvest Festival on the Las Vegas Strip, killing 59 people and injuring more than 500.
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In a surprise interview with Ellen Degeneres, Mandalay Bay security guard Jesus Campos explained how he came to be the first person in the hotel to know the shooting was taking place.
He said he first became aware something was amiss when he noticed brackets had been installed on a hallway door, resulting in it no longer being able to be opened from the other side.
He said the brackets were "out of the ordinary", and called engineers to come and have a look at it before walking back down the hallway, past Paddock's room.
That's when things started going awry, Mr Campos said.
"As I was walking down, I heard rapid fire, and at first I took cover," he said.
"Then I felt a burning sensation. I went to go lift my pant leg up and I saw the blood. That's when I called it in on my radio that shots have been fired."
Mr Campos said Paddock had fired through his hotel room door, presumably after hearing noise in the corridor, and his gunfire had struck him in the leg.
When one woman came out of her room in response to the noise created by Paddock's gunfire, Mr Campos told her to stay back and take cover.
He did the same for the building engineer who came to look at the door, Stephen Schuck, who told Degeneres Mr Campos had saved his life.