The man behind the worst mass shooting in modern US history was a multi-millionaire real estate investor, according to his brother.
Stephen Paddock, 64, was identified by police as the gunman who killed at least 58 people after opening fire from the 32nd floor of a Las Vegas hotel.
The Nevada native targeted concert-goers at the Route 91 Harvest Festival on the Las Vegas Strip late on Sunday night.
Records show Paddock lived in a two-bedroom house in the tiny desert community of Mesquite, 80 miles northeast of Las Vegas, close to Nevada's border with Arizona.
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That house is currently being searched by detectives, Clark County Sheriff Joseph Lombardo has said.
His brother Eric Paddock spoke of his shock and described his sibling as a gambler with "no religious affiliation, no political affiliation" who was "not an avid gun guy at all".
He told CBS News: "The fact that he had those kinds of weapons is just... where the hell did he get automatic weapons?
"He has no military background or anything like that. He's a guy who lived in a house in Mesquite and drove down and gambled in Las Vegas."
Eric Paddock told reporters his brother was a multi-millionaire who made much of his fortune by investing in real estate.
He added that his brother was also an accountant for many years, but he was not aware of any recent financial difficulties he may have had.
Paddock lived in the Mesquite property with Marilou Danley, 62, records show.
Ms Danley was named as his "companion" and police initially treated her as a person of interest in the shooting.
But Sheriff Lombardo later said she was out of the country at the time of the shooting and she was not believed to have been involved.
Paddock used some of her identification to get into the hotel, where he had been staying since 28 September.
The suspect had a hunting licence in Texas, where he had lived for a number of years.
He also had a pilot's licence, and had at least one single-engine aircraft registered in his name.
Eric Paddock said his brother recently sent a a walking aid to his 90-year-old mother in Florida following the damage caused by Hurricane Irma last month.
Their father, Benjamin Hoskins Paddock, was formerly on the FBI most wanted list after carrying out a string of bank robberies and escaping from a Texas prison in the late 1960s.
FBI agents arrested him in 1978 at the Bingo Center in Springfield, Oregon, which he had been running.
A bureau poster described him as a "psychopath" who should be treated as "armed and very dangerous".
Paddock is believed to have killed himself before a police SWAT team used explosives to blast their way into his room at the Mandalay Bay Hotel.
At least 10 guns, including long rifles, were found inside the room, Sheriff Lombardo said.
He added: "We have no investigative information or background associated with this individual that is derogatory.
"The only thing we can tell is he received a citation several years ago, and that citation was handled as a matter of normal practice in the court system."
Eighteen additional firearms and explosives have been retrieved from a house in Mesquite.
Media reports said Paddock had previously lived in Nevada, California and Florida.
At least 58 people were killed and more than 500 injured in the mass shooting.