Paddock's girlfriend, Marilou Danley, 62, who was in the Philippines at the time of the Sunday night shooting, was met by Federal Bureau of Investigation agents at the Los Angeles airport late Tuesday, according to a law enforcement official who wasn't authorized to discuss the matter publicly and spoke to The Associated Press on condition of anonymity.
Mendoza and other workers told the Times that they immediately recognized Paddock on the news, because he visited frequently with Danley. NBC says that Danley traveled to the Philippines on September 25 via Hong Kong.
Shortly afterwards she moved to the United States - this is where her history appears more complicated. Paddock turned his attention to those outside his door and fired, wounding one of them.
'The investigation with her is ongoing and we anticipate some information from her shortly.
She was expected to be questioned upon her arrival in Los Angeles, the New York Times reported. "Then she would softly say, 'OK" and step back behind him.
So far, investigators have found nothing to explain Paddock's actions, but were continuing to hunt and trace every possible clue about a gunman they described as a "psychopath".
No motive has emerged yet for the deadly shooting spree by Paddock, a wealthy, 64-year-old retired accountant who liked to gamble for high stakes and owned a comfortable home at a golf course retirement community near Las Vegas.
Investigators say that the shooting rampage was meticulously planned and included specially modified weapons.
He used "bump stocks", attachments that allow a semi-automatic rifle to mimic a fully automatic weapon by unleashing an entire large magazine in seconds. She was out of the country during the shooting, police said.
Marilou Danley, who USA authorities have described as a "person of interest" in the investigation, left Manila on Tuesday evening aboard Philippine Airlines Flight PR 102, according to Philippines immigration spokeswoman Antonette Mangrobang.
Danley, who it is believed was born in the Philippines, is reported to have lived on the Gold Coast in Queensland 20 years ago.
Stephen Paddock, a reputed heavy gambler, allegedly wired almost $100,000 to the Philippines prior to the shooting in which he took his own life.
In an interview with the Fort Worth Star-Telegram, Juertes said: "He wasn't very sociable". But officials haven't been able to say exactly when the money transfer took place or who was the recipient. Danley's sister also echoed the sentiment, saying Marilou had no knowledge of Paddock's plans and that "she was sent away".
Police said they're investigating the source of the leaked photos.
A total of 47 guns have been recovered from three locations: Paddock's hotel room and his two Nevada homes in Verdi and Mesquite.
A stash of explosive ammonium nitrate was also found in Paddock's vehicle.