Las Vegas shooter's girlfriend could be central to investigation

After the discovery of weapons, ammunition and explosives at the home they shared, authorities are eager to question Marilou Danley about what, if anything, she knew about Stephen Paddock's plans.
3:15 | 10/04/17

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Transcript for Las Vegas shooter's girlfriend could be central to investigation
As we said the gunman's girlfriend, Marilou Danley was met by FBI agents when she landed in Los Angeles last night from the Philippines and we have new images from her time in the Philippines. You see them right there, of course, investigators want to know from her whether she had any warning about this at all. She is a person of interest in the case. Our chief investigative correspondent Brian Ross here with more. Good morning, George. She has quite a story to tell with a portrait emerging of a man descending into madness showing signs of mental illness, crazy eyes, losing weight, a decline in his physical appearance according to one person briefed on the new findings, jealous of his girlfriend's ex. Her family saying he sent her away so she wouldn't get in the way of his plans. A major step forward in the investigation this morning. As the shooter's girlfriend arrived in Los Angeles overnight on a flight from the Philippines. Marilou Danley was Stephen paddock's girlfriend for at least three years with him up until just two weeks before the shooting. She had to know he had some kind of mental health issue, stress in his life and had to know that was going on. Reporter: Authorities now label her as central to the investigation after first dismissing the possibility she played any role. Currently she's a person of interest. Reporter: Especially after the discovery by police of so many weapons, so much ammunition and explosives at the home they shared in Mesquite, Nevada. How could she not know what was going on in her own house with these weapons? She had to know something at the very least question him as to where are these weapons coming from? Why do you have all these weapons? Reporter: Danley's sister spoke to Australian TV station with their faces blurred and say she had no idea of paddock's plans. He sent her away so that he can plan what he is planning without interruptions. In that sense I thank him for sparing my sister's life but that won't be to compensate the 59 people's lives. Even though she's going to the Philippines until Steve said, Marilou, I found you a cheap ticket to the Philippines. Reporter: According to documents obtained by ABC newsdanley traveled to her home country the Philippines two weeks before the shooting on September 15th. Paddock actually visited her family in the Philippines four years ago and one of them posted these photos on Facebook. U.S. Officials also want to know from the girlfriend why paddock began to transfer tens of thousands of dollars to someone in the Philippines prior to the shooting. We've got a lot of question, I can tell you that. Reporter: According to relatives Danley apparently met paddock at this hotel casino in Reno where she worked as a hostess to entertain high rollers like paddock. Employees at this bar in Mesquite and former neighbors say the couple were regulars playing video poker and the slots as they downed beer and shots of tequila. They were professional gamblers and that's what they did for a living. Reporter: Now authorities hope the girlfriend can help solve the mystery with the FBI standing by to get her to las Vegas later today. This morning her brother in the Philippines told ABC news she told her family she has a clean conscience. She's still not a suspect. Authorities think she may know more about his state but not necessarily involved. Described only as a person of interest which is a different category. Okay, Brian Ross, thanks very

This transcript has been automatically generated and may not be 100% accurate.

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