But while officials have confirmed that Marilou Danley was in the Philippines on Sunday when Paddock opened fire on a crowd attending a country music festival on the Vegas Strip, it was not known whether the money was for her, her family, or another objective.
It is still unclear whether Danley was the girlfriend of Paddock, who U.S. reports say was going through a divorce before carrying out the massacre which ended when he killed himself.
Danley lived with Paddock in Mesquite, Nevada, northeast of Las Vegas. Fifty-eight people were killed and more than 500 were wounded in the attack. He had a camera installed in his hotel room and had piled up 24 guns and thousands of rounds before opening fire from a hotel window at people attending the concert.
Ms Danley, who is considered a person of interest in the shooting investigation, was escorted through Los Angeles International Airport by FBI agents in a wheelchair on Wednesday night after flying in from the Philippines.
It is not yet clear when Marilou, an Australian national, left the United States, but she flew from Hong Kong to Manila on September 25. Danley was allegedly in the Philippines during the attack and was met by Federal Bureau of Investigation agents upon her arrival at LAX.
Cops admitted they were not yet sure of the Vegas gunman's motives, with Clark County Sheriff Joseph Lombardo telling reporters: "We have no idea what his belief system was - I can't get into the mind of a psychopath".
Meanwhile, a nephew of Paddock's girlfriend says he's stunned didn't even know that Paddock was interested in guns.
The abuse would come when she asked to use his casino card to make the purchase, Mendoza said. Paddock turned his attention to those outside his door and fired, wounding one of them.
Danley in February 2015 filed a joint petition for divorce with her now ex-husband, whose surname she has kept, court records show.
Danley was originally called Stephen Paddock's roommate, but later identified as his live-in girlfriend.
Danley, 62, is a Philipinnes native and investigators say she likely traveled there to visit family.
Paddock ended Sunday night's shooting spree, the deadliest in modern USA history, by killing himself.
The casino said in a statement she stopped working there "several years ago" and that it had no information on the pair.
Employees at the Mesquite Starbucks said that after seeing his face so many times, it didn't take them long to recognize the man who's mugshot was soon plastered onto screens across the nation after Sunday's mass shooting at the Mandalay Bay Resort and Casino.
Police are not aware whether the devices were transmitting - the FBI is investigating their use - but the Clark County sheriff told reporters he thinks the shooter might have used them to watch for people approaching his room.
A woman lights candles at a vigil on the Las Vegas strip following a mass shooting at the Route 91 Harvest Country Music Festival in Las Vegas on October 2, 2017.
"Our family doesn't know Stephen Paddock, and has no knowledge of Marilou's relationship with Mr. Paddock".
'We are making progress, ' the sheriff said in determining Paddock's motive. Investigators then wanted to know who he knew, and did they know about the attack.
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