Halla and the victim were among the passengers on board a tour bus traveling from Modesto to Chukchansi Casino in Madera County.
Investigators say Halla punched the victim several times and shouted racial slurs when the victim refused to contribute to a tip for the driver.
The victim is in his 70's and investigators say he speaks no English.
Halla was arrested by Oakhurst Highway Patrol Officers when the bus arrived at the casino.
