The girlfriend of Las Vegas gunman Stephen Paddock has arrived in the United States, where she is due to be questioned by police, according to BBC.
Marilou Danley was met by federal agents as she landed in Los Angeles from the Philippines on Tuesday night.
Paddock reportedly wired $100,000 (£75,400) to her in the Philippines before the rampage.
US President Donald Trump will visit Las Vegas on Wednesday to console a shocked nation.
“Well, it’s a very sad thing,” Mr Trump told reporters at the White House as he left for Nevada.
“We’re going to pay our respects and to see the police who have done really a fantastic job in a very short time.”
The president also said “a lot more” was emerging about the gunman. “That’ll be announced at the appropriate time,” he added.
From his 32nd-floor suite at the Mandalay Bay Hotel, Paddock, a retired accountant with no criminal record, sprayed bullets into a crowd at a country music festival below. He killed 58 concertgoers and injured more than 500, before apparently killing himself.
Police officials quoted by the Reuters news agency said they hoped Ms Danley – an Australian citizen who moved to the US 20 years ago – would consent to be interviewed voluntarily.
Is Marilou Danley a suspect?
US authorities have named Ms Danley a “person of interest” in their investigation, , and said they made contact with her shortly after the shooting.
She had been in the Philippines since late September, local media reported.
Her sisters told Australian outlet 7News that Ms Danley had not known about the trip until Paddock told her he had bought her a ticket to the Philippines. “She was sent away… so that she will not be there to interfere with what he’s planning,” they said.
Paddock checked into the Mandalay Bay Hotel on 28 September, reportedly using some of Ms Danley’s identity documents.
The Philippines’ National Bureau of Investigation told AFP news agency it was investigating reports that Paddock sent $100,000 to Ms Danley in the Philippines days before the shooting.
Ms Danley’s sisters also told 7News that she had been wired that amount in the Philippines.
An unnamed US official told Reuters news agency that investigators were assuming the amount was intended as a form of life insurance.
What kind of relationship did the pair have?
Eric Paddock, the youngest brother of Stephen Paddock, told the New York Timesthat his brother loved and doted on Ms Danley.
“She was probably one of the only people I’ve ever seen that he’d go out of his way to do a little thing for,” he said.
But the pair are also said to have had a turbulent relationship, according to other reports. The Los Angeles Times has spoken to people who witnessed Paddock verbally abusing Ms Danley at a coffee shop in Mesquite, Nevada.