The Australian girlfriend of Las Vegas mass murderer Stephen Paddock is expected to be interviewed by police on her return to the US from the Philippines.

Australian citizen Marilou Danley, Vegas shooting

Australian citizen Marilou Danley has been cleared of direct involvement in America’s worst shooting, in Las Vegas on Sunday, but investigators are anxious to find out about her boyfriend, Stephen Paddock’s, state of mind prior to the massacre. (Image: Facebook)

Marilou Danley, 62, a Philippine-born Australian citizen, has been cleared of any direct involvement in the worst US mass shooting in recent history but remains a “person of interest,” according to Las Vegas Metropolitan Police Department Sheriff Joe Lombardo, as of Tuesday morning, local time.

Investigators said some of Ms Danley’s identification had been used to book the Mandalay Bay hotel room where the atrocity was committed. She’s due to return to the US on Wednesday.

Worst Mass Shooting

At least 58 people were killed and 515 were injured when Paddock, a 64-year-old retiree from Mesquite, Nevada opened fire from his room on the 32nd floor of the Mandalay Bay Resort and Casino onto a crowd watching Jason Aldean’s performance at the Route 91 Harvest Festival.

Paddock committed suicide with a gunshot to the head seconds before police entered the room.

Police still want to discover whether Danley, who lived on Queensland’s Gold Coast for more than a decade before she became a casino worker in Las Vegas and eventually moved in with Paddock, knew about her boyfriend’s sizeable weapons cache, or indeed any of his plans.

Mystery Payment

They are also curious about a $100,000 payment wired by Paddock to the Philippines the day before the massacre. They want to determine whether this was a parting gift to Danley, or whether Paddock intended to flee to the Philippines, or whether it was for something else entirely. Paddock was a multi-millionaire who had made his fortune investing in property.

Ultimately, police are still trying to figure out why someone with no apparent prior mental health issues, zealous political affiliations or religious beliefs, or an interest in guns, could have committed such an appalling act.

They’re hoping Danley might be able to fill them in on Paddock’s state of mind shortly before the shooting, although it’s possible we may never understand the motive behind the massacre.

Paddock was a high-rolling gambler, but according to casino records he seemed to be gambling even more heavily in the weeks prior to the shooting, making 16 transactions of over $10,000 in recent weeks, although it is not yet clear whether he won or lost.

He left neither a suicide note, nor a rambling manifesto, just an arsenal of 23 firearms strewn around his corpse.