Stephen Paddock, her live-in companion who killed himself moments before police stormed the Las Vegas hotel suite he had transformed into a sniper's nest on Sunday night, left no clear clues about why he staged his attack on an outdoor concert below the high-rise building.
Danley is the girlfriend of 64-year-old Stephen Paddock, who unleashed gunfire on attendees of the Route 91 Harvest Festival from the 32nd floor of the Mandalay Bay Resort and Casino.
It's been revealed Paddock placed cameras around his motel room so he could watch for police during his killing spree.
Although police have said they have no other suspects in the shooting itself, many questions remain about Paddock's motivation - and a possible link to ISIS. She left the United States for Hong Kong on September 25.
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She was married for more than 20 years to her second husband, Geary Danley, and the couple moved to Nevada when they retired, the New York Times reported.
Las Vegas Sheriff Joe Lombardo said Tuesday his investigators were hoping to speak with the 62-year-old woman.
Authorities are also looking into a $100,000 money transfer that Paddock had made to the Philippines in the days before the attack too place.
Sherriff Lombardo also confirmed Ms Danley was a person of interest in the investigation.
Paddock smuggled a cache of 23 weapons into the hotel, including AK-47s and "bump stock" devices to make his guns fully automatic, in 10 separate bags.
The sisters, who were not identified by name and whose faces were blurred, added that Danley would willingly cooperate with investigators.
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Authorities are hoping to find answers when Paddock's girlfriend, Marilou Danley, is questioned on Wednesday.
Both Danley and Paddock appear to have been familiar with the location of Sunday's mass shooting.
Paddock ended Sunday night's shooting spree, the deadliest in modern USA history, by killing himself.
Police are not aware whether the devices were transmitting - the FBI is investigating their use - but the Clark County sheriff told reporters he thinks the shooter might have used them to watch for people approaching his room. She was out of the country the night the shooting happened.
Public records on Paddock point to an itinerant existence across the US West and Southeast, including stints as an apartment manager and aerospace industry worker.
Paddock had wired tens of thousands of dollars to someone in the Philippines over the past few months, law enforcement sources told ABC News. Police said they're investigating the source of the leaked photos.
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