A supervisor at the Las Vegas casino where Shane Devon Tamura worked legally purchased the gun used in the Midtown Manhattan shooting and sold it to him for $1,400, a law enforcement official told CNN Wednesday.

An attorney for the man who sold a rifle used in the Monday mass shooting in New York City said the sale of the firearm to the gunman was done in compliance with state and federal law.

The supervisor, who worked in the surveillance department at the Horseshoe Las Vegas, has not been publicly identified. Authorities say the individual has been cooperative and is not facing any charges at this time.

"He comes with a machine gun. He's not going to know who I am. He's going to shoot, no matter what," Sebije Nelovic said in a statement.

After a deadly shooting at Blackstone’s Midtown office, The Real Deal’s review of holdings found no direct investment in gun-related firms.