Stephen Paddock, 64-year-old wealthy former accountant and high-stakes gambler has been identified by police as the man behind the deadliest mass shooting in modern U.S. history when he opened fire from the Mandalay By Hotel and Casino on October 1, killing 58 people and injuring almost 500 others, before turning the gun on himself as police closed in.
Las Vegas Sheriff Joseph Lombardo had previously travelled to Mumbai after the 2008 attacks, and said the lessons he learned there had helped shape his officers' fast response to Paddock's shooting.
On Sunday, the marquee lights along the Las Vegas Strip dimmed for 11 minutes from 10:05 p.m. until 10:16 p.m., the exact time and duration of the gunfire one week ago.
Even as the gunman began firing on the crowd below - shooting for 10 minutes - police were not aware that the security guard was shot until they arrived on the hotel's 32nd floor. But on Monday, Lombardo said he didn't know what prompted Paddock to end the gunfire and take his own life.
Officers who stormed Paddock's room said they found an "armory" of guns and ammunition inside - along with a note suggesting the gunman had mapped out the trajectory of the bullets he would rain down on concertgoers.
Investigators are still piecing together evidence left behind in the hotel room and probing Paddock's background to determine why the retired accountant committed the worst mass shooting in modern United States history.
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He said the information police release is what they know at the time and everything is subject to change as the investigation develops.
Paddock's brother flew to Las Vegas this week to speak with investigators.
The sheriff said authorities were still investigating a motive behind the mass shooting, but they had uncovered no evidence that a second shooter was involved.
There is still no evidence Paddock was motivated by ideology, or that there was another gunman, he said.
But what exactly happened in the six minutes between Campos' getting shot and the mass shooting on concertgoers? He said the door was not Paddock's, but did not elaborate.
Paddock reportedly described gambling by night and sleeping by day, while taking Valium for anxiety in a court deposition taken four years before the shooting. "We believe he chose to take the lives he did and he had a very purposeful plan that he carried out".
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Fans at Sunday's game said they did not think they security measures went too far, and that they were on par with similar venues.
"We've run a thousand leads", Undersheriff Kevin McMahill of the Las Vegas Metropolitan Police Department told reporters on Friday.
"I have read them over and over and over again", Crawford said of her email conversations with Paddock.
"So, he had that written down and figured out so he would know where to shoot to hit his targets from there".
"I could see on it he had written the distance, the elevation he was on, the drop of what his bullet was gonna be for the crowd", Mr Newton said. He also drilled holes and bolted a metal bar to try to prevent the opening of an emergency exit stairwell door near the door of his room.
Lombardo also confirmed on Monday that federal investigators returned to search Paddock's home on Sunday in Mesquite, Nevada, as well as other property belonging to the suspect.
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"We are still speaking with Ms. Danley about the suspect's movement, gun purchases, and anything else we need to know about him and how he planned his assault - and who he came in contact with during the planning the phase", the sheriff said.