A gunman opened fire on an outdoor music concert last Sunday, killing 58 and injuring hundreds.
Sheriff Lombardo also said that Mr. Campos, after being shot, helped protect a maintenance worker from being injured.
The guard was investigating an alarm signalling that a door had been left open on the same floor as Paddock's room, officials said on Monday.
A few minutes later, Paddock began his 10-minute spree, killing 58 people enjoying a concert below.
Las Vegas hotel and gambling magnate Steve Wynn, who owns casinos that Paddock gambled in but not the Mandalay Bay, said Sunday that his hotels have undertaken special security measures in recent years to identify potentially risky guests.
Investigators expect to release a definitive timeline of Paddock's actions prior to the shooting once it is complete.
The ajar door was not Paddock's, but the sheriff had said it was a lucky coincidence that put the security guard at the shooter's location.
"Mr. Campos was encountered by the suspect prior to his shooting to the outside world", Lombardo said at a Monday news conference.
A note with calculations of where to aim to maximise casualties was found in the hotel room of Las Vegas gunman Stephen Paddock.
"We know that he attempted to shoot at the fuel tanks".
Detective Matthew Donaldson said, "I just threw them in the casino".
Las Vegas police officers had been searching the hotel for the gunman and did not learn the guard had been shot until they met him in the hallway after getting off the elevator, the sheriff has said.
"Because this individual purposefully hid his actions leading up to this event, and it is hard for us to find answers for those actions".
The cruises included stops at ports in Spain, Italy, Greece, Jordan and the United Arab Emirates, according to information provided by a law enforcement source who asked not to be identified because the source was not authorized to share information about the investigation.
Around 11:20 p.m., officers breached Paddock's door with explosives and entered his room.
"Stephen Paddock is a man who spent decades acquiring weapons and ammo and living a secret life, much of which will never be fully understood, " Lombardo told reporters. While Paddock claimed during his testimony that he had no history of mental illness, criminal convictions or history of addiction, he was reportedly prescribed Valium "for anxiousness". Lombardo added that investigators are attempting to establish a timeline of Paddock's whereabouts from September 25 through the 28.
According to Lombardo, Paddock had a document in the room with him, which contained numbers, but could not immediately say what they represented or what objective they served.
"Currently, we do not believe there is one particular event in the suspect's life for us to key on", the sheriff said. said.
The list was criticised by Mr Chuck Schumer and Ms Nancy Pelosi , the respective Democratic leaders in the Senate and House. The Trump administration ended the program in September and gave Congress six months to come up with a legislative solution.
Analyst research firms are expressing bullish stance on Bank of America Corporation (NYSE: BAC)'s near-term growth potential. Finally, Russell Investments Group Ltd. increased its position in Bank of America Corporation by 0.5% in the first quarter.
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