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 / Updated By Pete Williams, Tracy Connor, Kalhan Rosenblatt and Tom Winter 
 
 The suspected gunman behind the Las Vegas massacre made several large gambling transactions in recent weeks, according to multiple senior law enforcement officials and a casino executive. 
 
 On several occasions, Stephen Paddock gambled more than $10,000 per day — and in some cases more than than $20,000 and $30,000 a day — at Las Vegas casinos, according to an NBC News source who read the suspect's Multiple Currency Transaction Reports (CTR) and a casino gaming executive. 
 
 According to a U.S. statute, a CTR is a Treasury- and IRS-mandated report that casinos have to file when "each transaction in currency involving cash-in and cash-out of more than $10,000 in a gaming day." 
 
 It was not immediately clear whether those transactions were losses or wins. 
 
 Paddock's brothers were stunned to learn Monday that their sibling was the suspect in the largest mass shooting in modern U.S. history. 
 
 Eric Paddock of Orlando, Florida, said he had "no idea" why his 64-year-old brother committed the shooting. 
 
 "Mars just fell into the Earth," he said. "We're completely dumbfounded." 
 
 Eric Paddock said his brother was retired and was "just a guy" who stayed at hotels, gambled and went to shows. 
 
 Related: Trump Tweets Condolences on Las Vegas Massacre 
 
 Their brother Bruce Paddock, who lives in California, said his family grew up in Sun Valley, California. Their father, Benjamin Paddock, was on the FBI's Top Ten Most Wanted list in the 1970s for robbing banks and was described as psychopathic in an arrest warrant. 
 
 According to the warrant, the suspect's father carried a firearm and was considered "armed and dangerous." It listed his nicknames as "Big Daddy," "Chromedome" and "Old Baldy." 
 
 In 1960, The Arizona Republic described Benjamin Paddock as a three-time bank robber who was accused of stealing about $25,000. He was arrested in Las Vegas and "indicted on three counts of robbing Phoenix branches of the Valley National Bank," an archived article said. 
 
 The elder Paddock was sentenced to prison in Texas for the robberies. 
 
 But six months after his sentencing, he escaped and robbed a bank in San Francisco before being recaptured in Oregon, The Eugene Register-Guard reported in 1978. He had lived in Oregon for several years, evading capture by changing his name and appearance until his arrest, according to the paper. 
 
 Bruce, who said he hadn't talked to Stephen in about 10 years, said his brother made money through apartment buildings, which he owned and managed with his mother, who lives in Florida. 
 
 "I don't know how he could stoop to this low point, hurting someone else," Bruce said. 
 
 He added that his brother, who lived in Mesquite, Nevada, about 80 miles northeast of Las Vegas, was a laid-back, "never-in-a-hurry" type of guy. Bruce said his brother was a law-abiding citizen who never did anything violent prior to the shooting. 
 
 Martin J. Kravitz was the lead attorney for Cosmopolitan Hotels when Paddock sued the facility over a slip and fall in 2012. 
 
 "He was really kind of bizarre. He dressed slovenly to the deposition," Kravitz said. "He is the kind of personality that's slovenly and careless." 
 
 Kravitz said that Paddock did not seem angry and was not the kind of person who would have stood out. 
 
 At least 59 people were killed when Paddock opened fire into a crowd of approximately 22,000 at an outdoor country music festival from the 32nd floor of Las Vegas' Mandalay Bay Resort and Casino on Sunday night, police said. Police said at least 527 other people were wounded. 
 
 The shooting is not believed to be connected to international terrorism, authorities said. 
 
 The suspect was a licensed pilot who owned two planes. He also had at times obtained fishing licenses from Alaska. 
 
 It is believed he lived in a retirement community in Mesquite. 
 
 Public records show that Stephen Paddock lived a relatively transient life, having 27 different residences in California, Texas and Nevada. 
 
 From 1985 to 1988, he worked for a predecessor company of Lockheed Martin as an "internal auditor," public records show. 
 
 "We're cooperating with authorities to answer questions they may have about Mr. Paddock and his time with the company," Lockheed Martin said in a statement. 
 
 CORRECTION: (Sept 2, 2017, 7:55 p.m. ET) An earlier version of this article misstated the type of license Stephen Paddock obtained in Alaska. He bought a three-day fishing license once in 2009 and again in 2010, not a hunting license, according to officials with the state's Department of Fish and Game. 

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 CLOSE We're learning more about Stephen Paddock, the "lone wolf" in the deadliest shooting in modern U.S. history. USA TODAY 
 
 This undated photo provided by Eric Paddock shows his brother Stephen Paddock. (Photo: AP) 
 
 MESQUITE, Nev. — The man who carried out the deadliest shooting rampage in modern U.S. history was a retired accountant with a taste for high-stakes poker who had moved to Nevada just a couple of years earlier. 
 
 While investigators were still piecing together the attack by Stephen Paddock at a country music concert that left at least 59 dead and 527 wounded, the gunman's younger brother said the gunman had shown no signs of volatility. 
 
 The brother, Eric Paddock, added that he was "dumbfounded" as he searched for an explanation for why his brother, an affluent man — who appeared to be enjoying retired life taking cruises and visiting casinos — would decide to carry out such a brutal attack. 
 
 CLOSE The brother of the suspected Las Vegas shooter, Stephen Paddock, says he's in total disbelief. Eric Paddock says he last talked to his brother months ago via text and saw no warning signs that he would commit mass violence. USA TODAY 
 
 "There's absolutely no way I can even conceive that my brother would shoot a bunch of people he didn't even know," Eric Paddock told the USA TODAY Network in an interview. "There's no rationale. There's nothing anywhere that said why he did this." 
 
 Clark County Sheriff Joseph Lombardo said officers determined the gunshots were coming from a room on the 32nd floor of Mandalay Bay complex on the Las Vegas Strip. Authorities said it appeared Paddock killed himself. 
 
 Police said 23 weapons were found in the gunman's hotel room. Investigators also found 10 suitcases in the room that they believe were used to bring the arsenal of weapons into the hotel. 
 
 Also an undisclosed amount of ammonium nitrate, a type of fertilizer that has been used as a bomb component—most notably in the 1995 Oklahoma City bombing—was found in the suspect’s vehicle parked at the hotel. 
 
 CLOSE Police say the gunman in the Las Vegas Strip shooting had 23 firearms in his hotel room and an additional 19 at one of his two homes. Police say they're searching for a motive for the shooting. (Oct. 3) AP 
 
 Police also found two tri-pods positioned at the hotel windows in what appeared to be a fully-equipped sniper’s nest to take better aim at the crowd below. It appeared he had hammered out the windows of the room before shooting, authorities said. 
 
 Hundreds of rounds of ammunition were among the suspect’s possessions, a cache that could have sustained him in the assault, the official said. 
 
 "Right now, we believe it's a sole actor, a lone-wolf-type actor," Lombardo said. 
 
 Lombardo added that investigators have yet to determine a possible motive for the rampage. "I can’t get into the mind of a psychopath at this point." 
 
 Investigators, however, confirmed they have begun probing the gunman's gambling habits. Authorities are reviewing the recent transfers of thousands of dollars involving the suspect and links to gambling activities that would have tripped mandatory government notification requirements, the federal law enforcement official said. 
 
 The review is part of wide-ranging search for a possible motive in the attack. 
 
 More: 
 
 Investigators believe Paddock used the vantage point to fire on the 22,000 country music fans who gathered for the Route 91 Harvest Festival. He opened fire as the artist Jason Aldean performed. 
 
 Lombardo said law enforcement authorities had located a “person of interest” who he named as Marilou Danley, believed to be the suspect's companion. 
 
 Lombardo said that Danley was located outside the country. Authorities were already gathering information from her about Paddock, and the sheriff said investigators expected to continue to speak with her once she returned to the U.S. 
 
 The Islamic State claimed after the attack that Paddock was one of the terror group's "soldiers." But Aaron Rouse, chief of the FBI’s Las Vegas office, told reporters that investigators have found no links with the gunman to international terror groups. 
 
 Eric Paddock said he last heard from his brother via text message to inquire about how their mother was doing after Eric Paddock's Florida neighborhood lost electricity for several days following Hurricane Irma last month. He said that his brother was previously married but had no children. 
 
 Paddock added that his brother, who had worked as an accountant before retiring, had "no machine guns" when he helped move him from Florida to Nevada a few years ago. 
 
 "It’s like an asteroid just fell on top of our family," he said. 
 
 The owners of Guns & Guitars in Mesquite confirmed selling guns to Paddock more than once. But Janis and Mike Sullivan, the co-owners of the shop, noted they do not sell automatic weapons and are not licensed to do so. 
 
 
 
 “He passed every federal background check, every time he bought a gun,’’ Janis Sullivan, 67, told USA TODAY while standing behind the front-porch screen door of their house in Mesquite 
 
 The shooter is also believed to have purchased a number of weapons at Cabela’s in Verdi, Nev., a federal law enforcement official said late Monday. The official who is not authorized to comment publicly said that a number of big box gun dealers, including Cabela’s, have voluntarily contacted law enforcement authorities to provide information about the shooter’s gun purchases. 
 
 Paddock told the USA TODAY Network that their late father, Benjamin Paddock, was a convicted bank robber and they were raised without him for most of their childhood. 
 
 Benjamin, a garbage disposal salesman who was known as "Chromedome," "Big Daddy" and "Old Baldy," committed an armed robbery of a Phoenix bank in 1960 that netted him more than $4,600, the Tuscon Daily Citizen reported in 1971. 
 
 He later escaped from a Texas prison and for a time was on the FBI's Most Wanted List. He was captured in 1978 in Oregon, where he was running a bingo parlor. 
 
 The most-wanted poster that was first issued by the FBI in 1969 indicated that the father was “psychopathic” and “very dangerous” after escaping from a Texas prison. A federal law enforcement official, however, said that Benjamin Paddock’s past may have no relevance to his son’s actions. 
 
 Eric Paddock said, to his knowledge, his brother didn't have a history of mental illness or substance abuse. He said his brother owned guns and played high-stakes video poker. 
 
 In recent years, Paddock said they had gone skeet shooting and gambling together, but he had not detected anything was amiss. 
 
 But he also described his relationship with his brother as being somewhat distant. He said Stephen barely knew his children and he talked to him only every once in a while. He said he did not know Stephen's girlfriend well. 
 
 Eric Paddock did not offer details about his brother's career as an accountant, describing them as "normal, everyday guy jobs." 
 
 The gunman worked for the predecessor company of aerospace and defense giant Lockheed Martin from 1985 to 1988, the company said in a statement. The company did not release further details about his employment there. 
 
 Police blocked off the road to the suspect’s home in Mesquite, 80 miles northeast of Las Vegas. Records show that Paddock bought the home on Babbling Brook Court in 2015. 
 
 The Las Vegas Metropolitan Police Department obtained a search warrant and officers searched Stephen Paddock's home, said Quinn Averrett, public information officer for the Mesquite Police Department. 
 
 When law-enforcement agents completed an initial sweep of Stephen Paddock's home Monday morning, investigators found 19 additional weapons and thousands of rounds of ammunition, police said. 
 
 Investigators continued to search the residence, and FBI agents arrived at Stephen Paddock's property in Reno Monday morning. 
 
 Susan Page, a neighbor at the Reno home, described Paddock and his companion as "closet people" who "kept to themselves." 
 
 "I never saw them," she said of her neighbors. 
 
 The house in Mesquite is in a retirement community, Sun City Mesquite, an upscale development of about 1400 homes. The community includes an 18-hole golf course, indoor and outdoor swimming pools and a recreation center. Residents must be at least 55 years old, and no children are allowed. 
 
 He owned a home in a 55 and older community from 2013 to 2015 in Viera, Fla., but he rarely stayed there, according to neighbors. The gunman also previously lived in Mesquite, Texas. He sold his home in the North Texas town in 2010 
 
 “He seemed normal, other than that he lived by gambling. He was very open about that," said his former Viera neighbor Sharon Judy. "First time we ever met him, he handed us the key to the house and said, 'Hey, would you keep an eye on the house, we’re only going to be here every now and then.'" 
 
 Peter reported from Nevada, Glenn from Orlando, Johnson from Washington and Madhani from Chicago. Contributing: Tess Sheetz, Wayne T. Price, Sarah Litz, Kevin McCoy, John Bacon and A.J. Perez. 
 
 Read or Share this story: https://usat.ly/2kgk5FN 

 Eric Paddock helped his brother, Las Vegas shooter Stephen Paddock, move from Central Florida to Nevada two years ago to feed his video-poker habit and get away from the state’s humidity. 
 
 On Monday, he was trying to fathom how his brother could have opened fire from his 32nd-floor hotel room on the Las Vegas Strip Sunday night, killing at least 59 people and injuring more than 500 others who were at an outdoor music festival. 
 
 "An asteroid just fell out of the sky,” said Eric Paddock, 57, who lives in east Orange County. “We have absolutely no [idea] why in the world he would do something like this." 
 
 FBI agents showed up at Eric Paddock’s door Monday, wanting to know why his brother would commit the deadliest mass shooting in modern U.S. history. 
 
 Previously, Orlando held that dubious record for the June 2016 Pulse nightclub massacre, which killed 49 people and hurt at least 68. 
 
 Stephen Paddock killed himself in his room at the Mandalay Bay Resort and Casino as police closed in. 
 
 Eric Paddock, speaking outside his home, said his brother was never violent and had no history of mental illness. He also was not a veteran and, according to the FBI, had no ties to the extremist Islamic State group, which had claimed a connection. He was a gun owner, but Eric Paddock said he never knew his brother to have weapons powerful enough to do such damage. 
 
 “We are completely dumbfounded,” he said. “We can’t understand what happened.” 
 
 The Las Vegas sheriff said they found 18 weapons, explosives and thousands of rounds of ammunition at Paddock's home. 
 
 He lived in a retirement community in Mesquite, near the Arizona border. Eric Paddock said his brother was a retiree and high-level poker player. 
 
 Eric Paddock said his brother sold his 2-year-old house in Viera, north of Melbourne, and moved away partly to escape Florida’s humidity. 
 
 The current resident of Stephen Paddock’s former Brevard County home on Sansome Circle, Mick Anderson, 68 — who bought the house for $235,000 — said he didn’t know Paddock. 
 
 "What drives someone to do what he did? I just don't get it," Anderson said. 
 
 Sharon Judy said she met Paddock when she and her husband moved into the neighborhood of manicured lawns about the same time as he did. Paddock told her he wasn’t going to live there full time and gave her a key to check on his house. 
 
 “He was just a regular senior citizen to us,” Judy said. 
 
 She said Paddock described himself as a world traveler and "professional gambler by trade" and said he once showed her a picture of himself winning a $20,000 slot-machine jackpot. 
 
 Judy said she was shocked when she heard the news on the radio and didn't know the neighborhood connection to the shooting until reporters knocked on her door. 
 
 “He was real friendly, very outgoing, very open about what he did for a living,” she said. 
 
 Two special agents with the FBI arrived at Eric Paddock’s house shortly after 10 a.m. Monday. They interviewed him for about an hour and talked to his 89-year-old mother, who lives nearby. He also received a call from the Las Vegas police, he said. 
 
 Paddock said the last time he communicated with his brother was to text about a power outage at their mother’s home after Hurricane Irma. Eric Paddock said his brother talked to his mom a couple of weeks ago to check up on her and “everything was fine.” Stephen Paddock had bought her a walker recently. 
 
 Stephen and Eric Paddock’s father also had ties to crime, gambling and Las Vegas. 
 
 Benjamin Hoskins Paddock, who sometimes went by Patrick Benjamin Paddock, was a bank robber who was put on the FBI’s most-wanted list in 1969. A former garbage-disposal salesman and serviceman, according to a 1960 article by the Arizona Republic, he was arrested in Las Vegas that year and tried to run an FBI agent over with his car before he was captured. 
 
 He made the list after escaping from a federal prison in La Tuna, Texas, on Dec. 31, 1968, having served eight years of a 20-year sentence. The FBI at the time described Hoskins Paddock as a frequent gambler and avid bridge player. He had a wife and four children in Arizona, officials said in 1969. 
 
 Hoskins Paddock was captured in Springfield, Ore., in 1978. He had opened a bingo parlor for a nonprofit organization in Eugene, Ore., during his time on the lam. He died in 1998. 
 
 » Latest on the Las Vegas attack 
 
 » Who is Stephen Paddock, suspect in Las Vegas shooting 
 
 Staff writer Gal Tziperman Lotan contributed to this report. dharris@orlandosentinel.com, 407-420-5471 or @DavidHarrisOS
– The media is scrambling to get information about the 64-year-old identified as the gunman in what's now the worst mass shooting in American history. As of Monday morning, however, details about Stephen Paddock and any possible motive were scant. A brother who lives near Orlando, Fla., says he's "completely dumbfounded," per the Sentinel. "We have absolutely no idea," says Eric Paddock of the reason behind the shooting spree. "When you guys find out why this happened, let us know. I have no idea whatsoever." Here's what's out there: Mesquite: Paddock lived in Mesquite, Nev., about 80 miles northeast of Las Vegas. USA Today reports that he's owned a home since 2015 in an upscale retirement community complete with an 18-hole golf course. His home was being searched Monday. No criminal history: Police in Mesquite say they've had no previous contact with Paddock, while police in Las Vegas say there's been nothing beyond a minor traffic violation, reports the New York Times. ISIS claims responsibility: The Islamic State, meanwhile, claimed responsibility for the attack and said Paddock converted several months ago, but it provided no evidence to back up the assertion, reports the AP. The FBI later made clear it has found no connection between Paddock or any terrorist organization. Pilot: NBC News reports that Paddock had his pilot's license and owned two planes. He also had a hunting license in Alaska. Police found more than 10 guns in his hotel room at the Mandalay Bay Resort and Casino. Companion: Police tracked down a female companion named Marilou Danley, 62, but they say she has been cleared in the shooting. Paddock checked into the hotel through Danley's ID, reports the Atlanta Journal-Constitution. She has been described as Paddock's roommate or girlfriend.