Video emerged Tuesday showing the mishap that lead Stephen Paddock to file an unsuccessful slip-and-fall lawsuit against a casino — years before he became the most lethal mass killer in U.S. history. 
 
 Paddock, 64, fell to the floor as he walked through the Cosmopolitan Hotel on Oct. 30, 2011, surveillance video shows. He was going from a hotel store to a high-roller area in the casino. 
 
 Paddock claimed to have slipped on a puddle of liquid that hotel staff failed to clean up and asked for $100,000 in compensation. 
 
 The former accountant — who was a frequent visitor to Las Vegas — tore a hamstring. He incurred more than $32,000 in medical bills, records show. 
 
 MAP: Mass shootings in the United States since 2013 
 
 An undated photo of the Las Vegas gunman Stephen Paddock. (John Raoux/AP) 
 
 The case went to arbitration in 2014. But the arbitrator dismissed it after officials at the hotel successfully argued their cleaning staff didn’t have notice about the liquid spill that caused Paddock to fall. 
 
 Video surveillance shows a custodian going past the spot roughly a minute before Paddock’s fall, the arbitrator pointed out. The custodian and approximately 20 other hotel customers walked past the area and no one “noticed anything on the floor (or) tried to avoid a wet area,” the arbitrator ruled. 
 
 Mass shooting at Mandalay Bay Hotel and Casino in Las Vegas 
 
 Paddock accepted the final judgement and wasn’t “unhinged” over it, a source who knew Paddock at the time of the lawsuit said. 
 
 “I don’t think (the loss) had anything to do with (the shooting),” the source said. “I was as shocked as everyone. I am puzzled.” 
 
 Las Vegas gunman sent $100G to Philippines days before massacre 
 
 The hotel’s lawyer, Marty Kravitz, said Paddock was “unkempt,” “slovenly and careless” and “bizarre.” 
 
 “You wonder what a guy like this is doing at the Cosmo,” Kravitz told NBC after the shooting. 
 
 Video surveillance shows a custodian going past the spot roughly a minute before Paddock’s fall, the arbitrator pointed out. (Kravitz, Schnitzer, & Johnson via NBC News) 
 
 The lawyer noted Paddock “was wearing crappy flip-flops with a beverage in a bag in his hand” when he fell. 
 
 On Sunday night, Paddock, from his room in the Mandalay Bay, opened fire on a crowd of country music lovers, killing 58 people and injuring hundreds of others. 
 
 Sign up for BREAKING NEWS Emails privacy policy Thanks for subscribing! 

 Breaking News Emails Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings. 
 
 / Updated By Patrick Martin 
 
 Mandalay Bay shooter Stephen Paddock may have been a high-roller, but he lost a slip-and-fall lawsuit against a Nevada casino in 2014 — and still owed $270 in court fees when he killed at least 59 people Sunday, including himself. 
 
 Security video from the Cosmopolitan Hotel shows Paddock slipping and falling on Oct. 30, 2011, as he walked from a hotel shop towards a high-stakes area in the casino. Paddock said he had slipped in a puddle of liquid and sued the hotel in 2012, initially asking for $100,000, according to the attorney for the hotel, Marty Kravitz. 
 
 "They always ask for a lot more than they can get, but he got nothing," said Kravitz. 
 
 Kravitz met Paddock when he testified in a deposition for the lawsuit. Paddock enjoyed a special high-roller status with perks at at least one Vegas casino, but Kravitz described the man he met as "unkempt," "slovenly and careless" and "bizarre." 
 
 When Paddock fell at the hotel, said Kravitz, he "was wearing crappy flip-flops with a beverage in a bag in his hand." 
 
 "You wonder what a guy like this is doing at the Cosmo." 
 
 Security video from the Cosmopolitan Hotel shows Stephen Paddock leaving a store before he slips and falls en route to a high-stakes gambling area on Oct. 30, 2011. Kravitz, Schnitzer and Johnson 
 
 Kravitz also said, however, that there was "nothing about Paddock that would ever indicate someone who was unstable." 
 
 "This is not a guy that I would have looked at and thought, 'He's going to commit a crime one day.'" 
 
 The Cosmopolitan case was scheduled for a civil trial, but then went to arbitration in 2014. 
 
 According to the arbitrator's decision, Paddock reported incurring more than in $32,000 in medical bills, and also wanted to be paid for pain and suffering. Security video shows him getting medical attention and then being stretchered out of the casino. 
 
 Stephen Paddock is seen falling in security video from the Cosmopolitan Hotel. Kravitz, Schnitzer and Johnson 
 
 "As a result of the fall," said the document, "Mr. Paddock allegedly sustained a tear to his hamstring as well as a sprain/strain injury to his wrist" and elevated blood pressure. 
 
 The hotel maintained that Paddock had failed to prove negligence because "there was no actual or constructive notice of any liquid in the area of the sundry shop." 
 
 The arbitrator confirmed that the video does show Paddock slipping and falling, but also noted a custodian can be seen passing the same spot about a minute before Paddock's accident, followed by about 20 hotel customers, and none of them "appear to have noticed anything on the floor [or] tried to avoid a wet area." 
 
 Related: Stephen Paddock Had Gambling History 
 
 The arbitrator also said that on page 48 of his deposition, Paddock indicated the lighting in the accident area was "great," but had testified at a hearing in the case that "there is no way you are going to see liquid on the floor." 
 
 "Due to the totality of the evidence," ruled the arbitrator, "I therefore enter a decision in favor of the defendant." He also dismissed any allegations of negligence as "without merit." 
 
 Stephen Paddock waits for medical attention after falling at the Cosmopolitan Hotel. Kravitz, Schnitzer and Johnson 
 
 According to his brother Eric, Paddock was a millionaire, with real estate holdings in California. Caesar's Entertainment had granted him a "Seven Stars" designation as a frequent gambler "with status" at its casino properties, according to a source familiar with the investigation. Seven Stars is the highest level for high rollers, and is by invitation only. 
 
 In the weeks prior to his death, according to multiple senior law enforcement officials and a casino executive, Paddock had gambled large sums of money at Vegas casinos. Currency transaction reports show that Paddock had recently gambled more than $10,000 a day, a source who has read the reports told NBC News.
– Could a failed lawsuit be another piece of the Stephen Paddock puzzle? Video has emerged of the Las Vegas gunman slipping and falling in the city's Cosmopolitan Hotel in 2011, the New York Daily News reports. Paddock, who shot through the windows of another casino to massacre 59 people Sunday night, claimed to have slipped in a puddle of liquid and sued the Cosmopolitan for $100,000 in compensation. According to court records, Paddock tore his hamstring in the fall and had $32,000 in medical bills. The case was dismissed after it went to arbitration in 2014. The arbitrator decided Paddock had failed to prove negligence. Investigators are still trying to determine Paddock's motive for the mass shooting. Paddock was on his way to a high-roller part of the casino at the time of the fall, though Marty Kravitz, an attorney for the Cosmopolitan, tells NBC News that when Paddock showed up for a deposition, he was "unkempt," slovenly," and "bizarre." At the time of the fall, Paddock "was wearing crappy flip-flops with a beverage in a bag in his hand," the attorney says. "You wonder what a guy like this is doing at the Cosmo." Kravitz says, however, that there were no signs Paddock was unstable. "This is not a guy that I would have looked at and thought, 'He's going to commit a crime one day," he says. (Paddock's girlfriend has returned to the US from overseas.)