Suspected Las Vegas gunman Stephen Paddock wired US$100,000 to the Philippines last week, days before committing the deadliest mass shooting in United States history, NBC News reports.
Paddock's "friend", Marilou Danley, a 64-year-old Filipino-Australian, was out of the United States when Paddock shot and killed 59 people and wounded more than 525.
Danley, who is said to be on holiday in Japan with three girlfriends, lived a luxury life in a scenic desert resort-like retirement village 100km north of where Sunday night's shooting took place.
It is still unclear whether Danley was Paddock's girlfriend, as US reports say he was going through a divorce before carrying out the massacre, which ended when he killed himself.
In some reports, she has been described as a "room mate" and on her now-deleted Facebook page, a friend refers to her partner by the name of "Gary".
But the one-time hostess in the high-roller room of a Nevada casino appears to have lived with him in the affluent Mesquite, Nevada, retirement community, Sun City.
She, too, was previously married to an American man from Arkansas, with whom she had one daughter.
Paddock bought his home there in January 2015, for $369,000.
US reports say that on top of his divorce proceedings, Paddock had a gambling problem.
After first describing her as a "person of interest" in the aftermath of the massacre, Nevada Police have completely cleared Danley of any connection to the crime.