Responding officers found Victor Green, 24, shot to death in the club's parking lot. The shooter was nowhere to be found.
Police are searching for Matthew Atilano, 21, who witnesses say was the shooter.
"They shot him cold and left him laying in the parking lot, and I don't understand it," said Coty Marie, the victim's cousin. "He was a good kid, a family man."
Police don't have a motive for the shooting, but the victim's relatives said they heard racist remarks in the bar.
Police said Atilano is considered armed and dangerous.
Anyone with information is asked to call San Bernardino police at (909) 384-5656.