An old photograph of gunman Stephen Paddock, pictured next to his brother Eric, which the family provided to the media. AP Starbucks workers say they knew Stephen Paddock, the gunman responsible for the deadliest mass shooting in modern US history, as a cruel customer.

Employees from the Virgin River Casino location in Mesquite, Nevada told the Los Angeles Times that Paddock was known for berating his girlfriend, Marilou Danley, in public at the shop.

"He would glare down at her and say — with a mean attitude — 'You don't need my casino card for this. I'm paying for your drink, just like I’m paying for you,'" supervisor Esperanza Mendoza told the Times. "Then she would softly say,'OK' and step back behind him. He was so rude to her in front of us."

Mendoza and other workers told the Times that they immediately recognized Paddock on the news, because he visited frequently with Danley. Paddock would always order a venti mocha cappuccino, while Danley would order a medium caramel macchiato.

Danley was in the Philippines at the time of the shooting, according to law-enforcement officials. Clark County Sheriff Joseph Lombardo said Tuesday that Danley is still a person of interest in the investigation.