Mr. Paddock had recently wired thousands of dollars to the Philippines, a law enforcement official said.
âPerson of interestâ is a vague term that does not necessarily indicate that the person is suspected of committing a crime. Ms. Danley has not been charged with any crime.
Federal agents met Ms. Danley at her plane at Los Angeles International Airport, according to a law enforcement official. The official, who spoke on condition of anonymity because she was not authorized to speak to the news media, said Ms. Danley was not under arrest.
Television crews waited for Ms. Danley to emerge from customs at the international terminal. Hours after her flight landed, an airport police officer said she had been led out through a side exit after going through customs. NBC News posted a brief video that it said showed Ms. Danley in a wheelchair, being escorted by security officers.
In an interview with an Australian news station, two sisters of Ms. Danley said she had been sent to the Philippines two weeks before the shooting.
âHe sent her away so that he can plan what he is planning without interruptions,â one sister said. âIn that sense, I thank him for sparing my sisterâs life.â
But she said that would not compensate for the dozens who were killed.
The two sisters were interviewed anonymously, with their faces obscured. Ms. Danleyâs sisters Liza Werner and Amelia Manango live in Australia.
âShe didnât even know she was going to the Philippines until Steve said, âMarilou I found you a cheap ticket to the Philippines,ââ one of the sisters said.
They said their sister was âmadly in loveâ with Mr. Paddock and that she âprobably was even more shocked than usâ by the shooting. And they vouched for their sisterâs character, calling her a âgentle soul.â
âHe done this solely himself,â one said.
Family members and former neighbors were shocked to see Ms. Danleyâs name surface in connection with the shooting on news reports, as the police sought to find her hours after Mr. Paddock killed himself in his hotel room.
âSheâs probably one of the most happy, outgoing, full-of-life people Iâve ever known,â said Dionne Waltrip, Ms. Danleyâs former stepdaughter, who lives outside Fayetteville, Ark. âEveryone who has ever met her likes her.â
Ms. Waltrip said her father, Geary Danley, traveled the world as an auditor for FedEx and met his future wife overseas.
Ms. Danley has ties to the Philippines, and several news reports said she was born there. She spent many years in Australia, where news reports said she was married, and is an Australian citizen.
After meeting Mr. Danley, she moved to Memphis. The couple wed in 1990 and their marriage lasted 25 years.
Ms. Danley worked retail jobs, selling mostly clothing and jewelry. Both she and Mr. Danley had children from prior relationships. Ms. Waltrip was 20 when the couple got together; Ms. Danley has a daughter who now lives in California. The couple moved to Nevada when they retired.
âThey were extremely happy,â Ms. Waltrip said. âThey loved each other very much.â
But before the marriage ended, Ms. Danley met Mr. Paddock. She was working at a casino and he was a high-limit player, casino employees said. She worked there from 2010 to 2013, according to her LinkedIn account.
John Weinreich, an executive casino host at the Atlantis Casino Resort Spa at the time, said he believed that Ms. Danley frequently attended to Mr. Paddock, serving him food and pointing out which machines might be ripe for a payout, and eventually became his regular host.
âThen she was just gone one day,â he said. âI asked some fellow workers and they said she went off with Stephen.â
She and Mr. Danley divorced in 2015. On the divorce papers, she listed her address as a condominium in Reno owned by Mr. Paddock.
At the hilltop subdivision where the Danleys lived in Sparks, Nev., before the divorce, neighbors described Ms. Danley as a chatty extrovert who hosted cookouts and brought copious amounts of Filipino food to the semiannual block parties.
âShe was always cooking,â said Christine Riley, 46, a dietitian who lived a few doors down from Ms. Danleyâs former residence.
But when Ms. Danley was living with Mr. Paddock in a Reno subdivision, the couple were not viewed as sociable. âI thought maybe he was sick or something, because they were always in the house and the shades were always drawn shut,â said Susan Page, a retired financial analyst who was the coupleâs next-door neighbor.
Ms. Page said she occasionally saw Mr. Paddock working on an older sport utility vehicle that seemed to be Ms. Danleyâs car, and other neighbors said he had a large safe in the garage.
âThey werenât outgoing,â she said. âThey didnât participate in anything. Everybody around here, they go over to each otherâs houses, they have a drink and they chitchat.â
Ms. Page added, âIt wasnât that they were unfriendly, they just didnât socialize.â
On her own, Ms. Danley could be friendly. Connie Allred, a 68-year-old retired dental receptionist, occasionally attended Zumba classes with Ms. Danley at the subdivisionâs clubhouse. She described Ms. Danley as a warm âworld travelerâ who went abroad several times a year and visited family in the Philippines and Los Angeles.
âShe was always gone,â Ms. Allred said. âSheâs a hard one to keep track of. Weâd be in Zumba and then all of a sudden she would say, âIâm leaving for a couple months,â and then sheâd be back and then sheâs traveling other places.â
Philippine immigration officials said Ms. Danley left Manila on Sept. 22 for a trip to Hong Kong and returned on Sept. 25.
Eric Paddock, Mr. Paddockâs youngest brother, said his brother loved Ms. Danley and doted on her. For her part, he said, Ms. Danley made compromises like doing without perfume, hair spray and bubble baths in order to not set off his allergies. Though his brother was a multimillionaire, he said, he did not believe she was with him because he had money.
Some people who knew Mr. Paddock said he could take on an imperious, exacting demeanor. But with Ms. Danley, he was different, Eric Paddock said.
âShe was probably one of the only people Iâve ever seen that heâd go out of his way to do a little thing for,â he said. âHe went out of his way to be nice to her. This is not something Steve does â go out of his way.â
He added: âSteve expected people to wait on him for the most part. But he waited on her sometimes. He would do what she wanted to do. He would defer to her in the way that he wouldnât to the rest of humanity. Even me.â