Las Vegas gunman appears to have scouted other targets

Stephen Paddock booked hotel rooms in Chicago during Lollapalooza and conducted a Google search for "hotels around Fenway Park" in Boston.
2:51 | 10/06/17

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Transcript for Las Vegas gunman appears to have scouted other targets
We're turning now to the new developments in the Las Vegas shooting. Overnight thousands gathered at a vigil for Charleston Hartfield an off-duty police officer who died saving lives at the route 91 harvest festival and this morning we're learning more about the gunman, Stephen paddock, investigators trying to determine if he was scouting targets in Boston and Chicago and they're also uncovering more about his secret life. Our chief investigative correspondent Brian Ross is here with all of those details. Good morning, Brian. . Good morning Amy. Las Vegas prostitutes have provided the most telling account. A regular customer without emotion and cheap except when it came to his plans for mass murder. Paddock spared no expense even considering travel to other targets in Chicago and Boston. According to law enforcement officials, he booked rooms but never checked in at Chicago's Blackstone hotel in August. The same dates as the lollapalooza festival across the street in grant park. Attracting hundreds of thousands of people. Including one of president Obama's daughters. Officials also tell ABC news he conducted a Google search for hotels around Fenway park in Boston. The ballpark's capacity nearly 38,000 people. Instead, he stayed close to home where there was nothing cheap about his attack preparations. Experts say the weapons found in his hotel suite were high-end and high-powered, the kind used by U.S. Special forces and commandos. Officials tell ABC news some of the ammo was bought under a name not his leading to speculation of a possible accomplice in there's people that know this individual. There's people that can help us understand this individual. Reporte and the FBI got some insight about paddock from an unlikely place, the Reno car dealership where he bought this car on August 1st, paying cash with a check for $14,411. Not a sign of someone with financial problems. Marilou wanted to get a Lexus but he said I'm not going to pay $10,000 more for a car with the same equipment. Reporter: She says he saved her from a troubled marriage. She said she had a bad relationship prior to him and he had turned her life around and really helped her out. After a full day of questioning on Wednesday by the FBI officials this morning say they still have more questions for Marilou Danley who main tapes she had no idea her live-in boyfriend was making plans to kill so many people. Brian, what about the other woman, this mystery woman we've heard so much about who may have spent some of those final days with paddock? Have we learned who it is. Authorities believe she was a lady of the evening, one of many who knew Mr. Paddock well. Brian, thank you.

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

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