Paddock led such a low-key, private life that no one seemed to know him well, and those who did had no sense he was capable of the deadliest mass shooting in modern American history.
Where other mass killers have left behind a trail of plain-sight clues that help investigators quickly understand what drove them to violence, Paddock, 64, had nearly no close friends, social media presence or other clear connections to the broader world.
Even the No 2 official in the FBI said yesterday he was surprised investigators have not uncovered more about why a man with no obvious criminal record would cause so much bloodshed.
Working with what little they know, investigators have zeroed in on a weapon-buying binge Paddock went on one year before he gunned down 58 people on Sunday at a country music festival from a 32nd-floor room at the Mandalay Bay casino resort before killing himself.
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They wonder if he had some sort of mental break at the time that drove him to start making plans for mass murder.
They know he was a major gambler and are looking at related records, though even in very public casinos he played the very private game of video poker.
They know he had a plan to survive the shooting and try to escape, though would not say how.
"This individual and this attack didn't leave the sort of immediately accessible thumbprints that you find on some mass casualty attacks," McCabe said. "Putting aside the somewhat dubious claims of responsibility that we see in each one of these instances, we look for actual indicators of affiliation, of motive, of intent, and so far we're not there. We don't have those sort of indicators."
Some who thought they knew him intimately could provide no help.
"He never said anything to me or took any action that I was aware of that I understood in any way to be a warning that something horrible like this was going to happen," Marilou Danley, 62, said in a statement read by her lawyer outside FBI headquarters in Los Angeles.
Analyzing Paddock's computer, cellphone and other electronic devices, Investigators have found no obvious ideological motive, no clear connection to extremists or activist groups or outward display of mental illness.
Paddock wired USD 100,000 to the Philippines days before the shooting, said a US official who was not authorised to speak publicly because of the continuing investigation. Investigators are trying to trace that money.
Danley, who was overseas for more than two weeks, said she was initially pleased when she was wired money from Paddock to buy a house for her family in the Philippines. But she later feared it was a way to break up with her.
The previous weekend, Paddock had rented a high-rise condo in a building that overlooked the Life is Beautiful alternative music festival featuring Chance the Rapper, Muse, Lorde and Blink-182, said Lombardo, who offered no other details about what led Paddock there.
On September 28, the 64-year-old high-stakes gambler and real estate investor checked into Mandalay Bay and specifically requested an upper-floor room with a view of the Route 91 Harvest music festival, according to a person who has seen hotel records turned over to investigators.
Authorities are looking for hints in those details of the kind of life he lived, and the kind of victims and venue he targeted, said David Gomez, a former FBI national security and criminal profiler.
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