"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", Officer David Newton from the Las Vegas Police Department's K-9 unit said.
Occasionally, Paddock shared news of his gambling winnings, his brother said, recalling a photo text message he received showing a $40,000 payout.
Clark County Undersheriff Kevin McMahill said investigators remain largely in the dark after running down more than 1,000 leads seeking clues to what drove a wealthy retiree with a penchant for gambling to carry out the deadliest mass shooting in modern US history.
A MUSIC fan who told her family she was the "safest person to be around" survived her second mass shooting when she was caught up in the Las Vegas massacre. He also stockpiled at least 12 bump stocks - devices used to increase the speed at which a gun can fire.
"While some of it has helped to create a better profile into the madness of this suspect, we do not, still, have a clear motive or reason why", said McMahill.
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In a possible sign he was contemplating massacres at other sites, he also booked rooms overlooking the Lollapalooza festival in Chicago in August and the Life Is Beautiful show near the Vegas Strip in late September, according to authorities.
It turned out Paddock had already shot and killed himself when they finally entered. Our sources say he then called the hotel and asked for a view room.
Also, the weekend before the Las Vegas bloodbath, Paddock rented via Airbnb - and checked into - a condo in a 21-story luxury building in Las Vegas that overlooked the Life is lovely alternative music festival, Sheriff Joseph Lombardo said Tuesday.
"It is fantastic that the security guard didn't sustain additional injuries", Lombardo said.
Paddock sent Ms Danley on a trip to her native Philippines before the attack, and she was unaware of his plans and devastated when she learned of the carnage while overseas, she said in a statement.
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Now, his option would have been try to do it himself. "It was the security guard", Lombardo said during a news conference. Campos and all of our officers are recognized for what they do every day, which is protect people", Telegraph reported .
Some time after Paddock began firing on the crowd, a door to another room on the 32nd floor was left ajar, triggering an alarm inside the hotel, McMahill said.
- As NPR's Lauren Hodges and Doreen McCallister report, Paddock's girlfriend, Marilou Danley, who was visiting family in the Philippines at the time of Sunday's shooting, says through her lawyer that the man she described as a "kind, caring, quiet man" gave her no "warning that something very bad like this was going to happen".
Danley, who was overseas in Asia at the time of the shooting has told investigators she had no idea Paddock was plotting a mass shooting. Girlfriend of the active shooter in the Sunday, Oct. 1, 2017, incident, Danley, 62, returned to the United States from the Philippines on Tuesday night and was met at Los Angeles International Airport by Federal Bureau of Investigation agents, according to a law enforcement official. The Australian citizen of Filipino heritage is cooperating fully with authorities, her lawyer said. At the time, she anxious he was trying to break up with her, she said.
But police suspect Paddock may have had assistance at some point before the killings, based on the large number of guns, ammunition and explosives that were found in the hotel suite, his home, his auto and a second home searched in Reno. But they were continuing to investigate "whether anybody else may have known about this incident before he carried it out".
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