Family and friends of Stephen Craig Paddock say they were shocked to learn that he was the man police say opened fire on a Las Vegas country music festival, killing at least 58 and injuring hundreds in the deadliest shooting in modern U.S. history.

Its like he shot us, Eric Paddock, the suspected shooters brother, told The New York Times. I couldnt be more dumbfounded.

Stephen Paddock, 64, was avid gambler who lived in an upscale retirement community in Mesquite, Nevada, his family said. According to police, he traveled to Las Vegas on Thursday, checking into the Mandalay Bay Resort and Casino. It was from his hotel room on the 32nd floor that, around 10:15 p.m. on Sunday, he fired a fusillade at thousands of people across the street watching a performance by Jason Aldean at the Route 91 Harvest Festival.

A SWAT team blew open the entry to Paddocks hotel room with an explosive and found him dead, police said. Authorities found 23 weapons in the room, including assault-style rifles and some arms that may have been modified in an attempt to convert them into machine guns, Reuters reported. The cache included AR-15-style and AK-47-style rifles and a large amount of ammunition.

An additional 19 firearms, explosives and thousands of rounds of ammunition were found at Paddocks home in Mesquite, totaling 42 weapons in his possession, Reuters reported.

Paddock is reported to have smashed hotel windows prior to the shooting with a hammer-like device. A law enforcement official said two rifles with scopes on tripods were found positioned in front of the broken windows.

The violence was at odds with how family, friends, and neighbors described Paddock, who police said had no serious criminal record.

His brother, Eric Paddock, told reporters that Stephen Paddock was a multimillionaire who invested in real estate and previously worked in accounting. Paddock worked for a predecessor company of Lockheed Martin from 1985 until 1988, the company said. Eric Paddock, who lives in Central Florida, said his brother was retired and described him as just a guy who frequented Las Vegas hotels, gambled and attended shows.

He added that his brother was never violent and had no history of mental illness. He had no religious affiliation and no political affiliation, he said.

Paddock and his three brothers were raised by a single mother who moved the family around the country to places like Iowa and Arizona, another brother, Patrick Paddock II, told The New York Times. The boys father, Benjamin Paddock, was a bank robber who made the FBI s Most Wanted List after breaking out of prison. Their mother told them their father had died, Patrick Paddock said.

Stephen was the least violent in the family during my childhood, Patrick Paddock said. So, its kind of like, Who?