Authorities have 'no credible information' about Las Vegas gunman's motive

FBI agents and police say they are skeptical about Marilou Danley's claim that she knew nothing about her boyfriend's plans for the attack that killed dozens of concertgoers on Sunday.
2:29 | 10/06/17

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Transcript for Authorities have 'no credible information' about Las Vegas gunman's motive
Also tonight, what was written on a note found in the gunman's hotel room as we learned how much the gunman made in the days before the attack and the millions he made in just one year. Here's Brian Ross. Reporter: She just returned to the us from the Philippines two days ago, but tonight federal authorities have put a close watch on Marilou Danley to make sure she doesn't try to leave the country as they struggle to find the motive behind her boyfriend's crime. We have no credible information to report to you as to motivation. Reporter: FBI agents and police say they are skeptical of Danley's claims that she knew nothing about the plans of her longtime boyfriend Stephen paddock. But a family friend who visited them in Nevada say that could well be true, that she was subservient to him. It's not what I saw as a loving, caring relationship. Reporter: Adam Lefevre told an Australian TV station he spent a week with the couple in Nevada in 2015, staying with them in a luxury casino suite, and later at his home, where paddock showed off what he called his gun room. He was very strict and very firm on the fact that it is a right, it is a capacity, and it is the freedom of every American resident and person to participate, to own a gun and use it as seen fit when need be. And that law should never be changed. Reporter: Late today authorities confirmed reports the shooter left behind some kind of a note, which authorities say contained a series of cryptic numbers, but was not a suicide note. Officials are tracking every aspect of his life, back to high school in Los Angeles and earlier, and his recent prescriptions for valium. We are looking at every aspect from birth to death of this suspect in this case. Reporter: In the final days before the shooting, officials tell ABC news he was in the company of a prostitute, and went gambling in the mandalay bay casino, winning big jackpots on both Friday and Saturday nights. Brian you were saying Stephen paddock called himself a professional gambler. In the year 2015 he reported income of $5 million. And no motive? That's right. Brian, thanks. I hope everyone will join us for an ABC news 2020 documentary presentation on the Las Vegas massacre, heart break and heroes. We have new reporting tonight at 10:00 eastern/9:00 central. Next to the white house tonight

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

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