Las Vegas gunman Stephen Paddock once tried to sue a Las Vegas casino after he slipped and injured himself while walking through the hotel.

CCTV footage used by Paddock during the lawsuit shows him walking between the hotel shop inside the Cosmopolitan and a high-stakes area when he falls.

The future attacker claimed to have fallen on a wet patch and attempted to claim $100,000 for medical bills and pain and suffering.

CCTV footage from the Cosmopolitan casino in Las Vegas, taken in 2011, shows an unkempt-looking Stephen Paddock slipping and falling inside the hotel

But the lawsuit was rejected as 'without merit' and he was left owing $270 in court fees, a debt he still owed when he shot himself dead on Sunday after killing 58 others and wounding more than 500 before turning the gun on himself.

The footage shows Paddock walking alongside other tourists wearing a scruffy t-shirt, dark trousers, flip-flops and carrying a plastic bag.

Attorney Marty Kravitz, who represented Paddock in the case, described him to NBC as 'unkempt', 'slovenly' and 'bizarre'.

'You wonder what a guy like this is doing at the Cosmo,' he added.

The footage was used by Paddock, described by his brother as a Vegas high-roller, to unsuccessfully sue the casino for $100,000

Arbitrators found Paddock's claim to be 'without merit' and ruled in favor of the casino, leaving him with a $270 for legal costs

However, like dozens of others who knew Paddock, Kravitz said there was nothing about the man that would have given him away as a potential mass killer.

Paddock's case was initially scheduled for trial, but went to arbitration, where documents show he claimed for $32,000 in medical bills, along with compensation for suffering and high blood pressure.

But arbitrators found no evidence of liquid on the floor, noting the CCTV showed several other people passing the same spot without difficulty, and ruled against him.

The incident sheds a further strange light on Paddock, who has been painted by others as a high-roller in Las Vegas.

The lawyer who represented Paddock in the lawsuit described him as 'slovenly', 'careless' and 'bizarre', but added there was nothing to mark him out as a killer

Paddock enjoyed 'Seven Star's status at all Caesar's Entertainment casino properties, which is an invite-only membership for high spenders

On Sunday Paddock became the worst mass shooter in US history, killing 58 people and wounding 500 from a vantage point inside the Mandalay Bay hotel (pictured)

In the days before his massacre, records show he was spending up to $10,000 a day on gambling, amassed from a property empire worth $2million.

Brother Eric recalled that the whole family once took over the top floor of Reno's Atlantis Casino Resort Spa at the casino's expense because they knew Paddock.

Paddock also held a 'Seven Stars' designation in all Caesar's Entertainment casino properties - an invitation-only status given to the top-spending frequent gamblers.

Eric described gambling as 'a job' and a source of income for Paddock, saying the casino was his 'second home'.