489 more were injured.
Investigators looking into Paddock also came across mention of Fenway Park.
The hotel is cooperating with the authorities on this matter, said Carragher.
Investigators trying to establish the motive for the attack have had little more to chase than hints and shadows.
His girlfriend, Marilou Danley, told FBI agents Wednesday that she had not noticed any changes in his mental state or indications he could become violent, the federal official said.
She told authorities that she couldn't believe that her "kind, caring, quiet" boyfriend could commit such a heinous crime.
Stephen Paddock reportedly booked the rooms in August at the Blackstone Hotel in Chicago.
Paddock, 64, broke two windows in his 32nd-floor suite, one of which was in line with the concert site and the other with a direct view of the fuel tanks, a source said.
Although Stephen never checked in to his booked hotel rooms (thankfully), it's scary to think of what could have been, considering the view he had.
The shooter reserved two rooms with checkout dates coinciding with the end of the festival.
The hotel management company did not immediately respond to requests for comment.
The crowds always fill Grant Park for Lollapalooza.
But he ultimately chose to mount an attack from the Mandalay Bay Resort and Casino across the street from the Route 91 Harvest country music festival held last weekend. The concert venue faces Lake Michigan, making an escape from gunfire "difficult if not impossible".
Hundreds of thousands attended the August music festival at Chicago's Grant Park, including Malia Obama, the former president's daughter. The hotel overlooks the main stage and entrance, but Paddock allegedly never showed up.
A source revealed to CBS the crazed mass murderer requested specific rooms overlooking the Life is handsome concerts but those rooms were unavailable.
In the days following the horrific shooting, it was reported that Paddock, who was found dead shortly after the massacre, had been planning to attack concert-goers at the Life Is Beautiful Festival, which was headlined by Chance The Rapper.