Officials say the Las Vegas shooter rented a room in downtown around the same time as an alternative music festival held Sept. 22-24.
Sheriff Joseph Lombardo told reporters that Stephen Paddock rented a room through Airbnb at the Ogden hotel in downtown Las Vegas but didn't know why. He says investigators have recovered items and video from the hotel.
The Life is Beautiful festival featured Chance the Rapper, Muse, Lorde and Blink-182.
Meanwhile, the Las Vegas shooter's girlfriend says in a statement that she knew him "as a kind, caring, quiet man."
Marilou Danley's lawyer read the statement to reporters on Wednesday in Los Angeles, where she was questioned by FBI agents about gunman Stephen Paddock.
Danley says Paddock found her a cheap ticket to the Philippines and wanted her to take a trip home to see relatives.
She says he wired her money while she was there to buy a house for herself and her family.
The statement says she worried that Paddock wanted to break up with her.
She added that "it never occurred to me in any way whatsoever that he was planning violence against anyone."
The high-stakes gambler who opened fire on a Las Vegas music festival crowd asked for an upper-floor suite that provided a view of the concert site.
A person who has seen Mandalay Bay hotel records that have been turned over to investigators said Wednesday they show Stephen Paddock asked for the two-room suite on the 32nd floor when he checked in last Thursday. The room wasn't available until Saturday and he moved into it then and opened fire from it the next night, killing dozens and wounding hundreds.
The person was not authorized to speak publicly and disclosed the information to The Associated Press only on condition of anonymity.
The person said Paddock was given the room for free because he was a good customer who wagered tens of thousands of dollars each time he visited the casino.