Stephen Paddock was "living a secret life, much of which would never be fully understood", Sheriff Joe Lombardo told reporters.
Police found the 64-year-old former accountant dead in a room on the 32nd floor of a hotel after he sprayed bullets on concert-goers below, injuring hundreds.
The gunman had around 23 weapons with him in the room, many of which were modified to make them shoot more quickly.
Police found explosives in his car at the hotel, along with about 1,600 rounds of ammunition.
The bulk of Paddock's weaponry was bought in the last year, but Sheriff Lombardo said it was not clear what motivated him to start buying so much equipment.
"Anything that would indicate this individual's trigger point and that would cause him to do such harm, we haven't understood it yet," he said.
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