The man responsible for the worst shooting in United States' modern history wired US$100,000 ($140,000) to an account in his partner's home country a few days before the attack, it has emerged.
Stephen Paddock, 64, rained bullets on attendees of a country music festival in Las Vegas from a nearby hotel on Sunday night (local time), killing 59 and injuring more than 500.
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His partner, 62-year-old Marilou Danley, was cleared of involvement - but law enforcement agencies have now discovered that money was wired from Paddock to an account in the Philippines.
Ms Danley is believed to have been in the Philippines when the shooting occurred, though some media is reporting she was in Japan. There has been confusion over her whereabouts as the Filipino Bureau of Investigation refused to release her travel records.
Ms Danley - who is also an Australian citizen after living in the Gold Coast in a previous marriage - is now en route to the US to meet with law enforcement.
They are reportedly hoping she can give some information on whether the money was being sent to her, to her family or for another reason.
Ms Danley's relationship with Paddock was still fairly new, with investigators believing they had only been dating since after March this year. She moved in to his home in Nevada when they started their relationship.
Investigators will also be trying to work out what Paddock's motive was for the killing spree when they meet with Ms Danley.
As of yet, no motive has been worked out, with Clark County Sheriff Joseph Lombardo saying they don't know what his belief system was and family members ruling out religious or political motives.