06 October, 2017
He had no criminal history before the shooting in which he killed at least 59 people and injured more than 500 from the 32nd floor of the Mandalay Bay Hotel.
A total of 47 guns have been recovered from three locations: Paddock's hotel room and his two Nevada homes in Verdi and Mesquite.
Authorities had been trying to track down Paddock's girlfriend since the attack happened and found out she had been visiting family in the Philippines. Investigators are still piecing together the motives for the shooting that killed at least 58 people and are now focused on one thing: what do we know about Marilou Danley?
With authorities now face-to-face with the Las Vegas mass shooter's girlfriend, her sister is speaking out about her leaving the U.S.in the weeks before the massacre.
Sheriff Joseph Lombardo says investigators are hoping to get some insight from Marilou Danley on why her boyfriend Stephen Paddock opened fire on a concert crowd from a high-rise hotel room.
"He talked about how he just moved closer to where we are", Chris Michel, owner of Dixie GunWorx, in St. George, Utah said of Paddock.
Ms Danley's two sisters, who live on the Gold Coast, insist their sister had no idea of the horror Paddock was plotting. Some lawmakers are already saying they need to take a second look at the law following the deadly Las Vegas shooting.
And prior to checking into Mandalay Bay days before the massacre, Paddock rented a room at a Las Vegas condo complex that overlooked another music festival.
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"Joining us today are numerous heroes who were here during that terrible moment, that frightful night", he said.
"As technology has come through in the last number of years I believe the original authors of the act probably did not envision this kind of accessory being used for modifications of this sort", he said.
"He texted me to ask about my mom after the hurricane", Eric Paddock said.
Pictures emerged from the hotel room showing Paddock lying dead, surrounded by weapons and spent ammunition.
He's accused of fatally shooting 58 people and wounding over 500 more in what's being called the worst mass shooting in US history.
Danley's sisters said in an interview said she holds the key to shedding light on his behaviour. "We met quite a few people and believe me, they are very lucky to be here".
"From October 2016 to September 28, 2017, he purchased 33 firearms, majority of them rifles", said ATF special agent in charge Jill Snyder. She said she was initially pleased when Paddock wired her money in the Philippines to buy a house for her family, but she later anxious it was a way to break up with her.
As investigators press on, President Trump is scheduled to fly to Las Vegas on Wednesday to meet with public officials, first responders and some of the people injured in the attack.
They say their sister was "madly in love" with Paddock and will be forever haunted by what her partner has done.