Occasionally, Paddock shared news of his gambling winnings, his brother said, recalling a photo text message he received showing a $40,000 payout.
David Becker/Getty Images Las Vegas police run by a banner on the fence at the Route 91 Harvest country music festival grounds after a active shooter was reported on October 2, 2017 in Las Vegas, Nevada.
The Associated Press reports that Stephen Paddock's girlfriend Marilou Danley was met but the FBI when she arrived to Los Angeles International airport Tuesday night from the Philippines, on the same day that the Clark County Sheriff Joseph Lombardo said that Danley was being treated as a person of interest in the mass shooting investigation.
Authorities are trying to determine why Stephen Paddock killed 59 people in the deadliest mass shooting in modern US history.
Police say the 64-year-old Paddock had an arsenal of 23 weapons and thousands of rounds of ammunition in his suite.
Stephen Paddock killed himself before police could reach him. I'm merely noting the facts as we now understand them - and how they differ from recent mass shootings.
The barrage from a 32nd-floor window in the Mandalay Bay hotel into a crowd of 22,000 people lasted several minutes, causing panic.
Earlier reports said that Danley was expected to return to US soil on Wednesday.
The official, who has been briefed regularly on the probe but spoke on condition of anonymity, said the working assumption of investigators was that the money was intended as a form of life insurance payment for Danley.
It's believed Paddock, who was found dead from a self-inflicted gunshot wound, may have used some of Danley's identification after checking into the hotel. Two of the cameras were attached to a room service cart, one in his room's peephole and one inside his room. He said in public that his visit would be "a very, very sad moment for me. for everybody no matter where you are, no matter what your thought process".
In 2012, Paddock sued the Cosmopolitan Hotel & Resorts in Nevada, saying he slipped and fell on a wet floor there.
Asked whether a "mental issue" or some other incident in a year ago may have compelled him to start his stockpile of weapons, Mr Lombardo said "yes, we are looking into that".
Donald Judy, who was Paddock's neighbor in Florida from 2013 to 2015, said Paddock told him that he was doing real estate speculation in Southeast Asia. He added, "We will struggle through it together". 19 other guns were found in his home. "There were bloodstains everywhere".
Almost 500 people were injured in the attacks. She could reveal more clues about Paddock's motives when investigators interview her.
After his escape, the Federal Bureau of Investigation named Benjamin Hoskins Paddock one of their "10 most wanted criminals", and warned that he was a "diagnosed psychopath" with suicidal tenancies. In the 1970s and '80s, he worked as a mail carrier and an IRS agent and held down a job in an auditing division of the Defense Department, according to the government.
An archived newspaper article from the Arizona Republic on October 6, 1960 described Benjamin Hoskins Paddock as a three-time bank robber. The following spring, Stephen Paddock was born. "He never cared about any of that stuff", Eric Paddock said as he alternately wept and shouted.
Nevertheless, his actions suggest that he had planned the attacks for at least a period of days.