Rock band Korn have appealed for information after a fan died following a fight at their concert in Atlanta, according to music magazine Billboard.
The group said they were "appalled at the actions" of the two attackers
Andy Richardson, 30, died in hospital after being attacked by two men in the mosh pit at the HiFi Buys Amphitheatre.
The band are headlining the 30-city Family Values Tour in North America.
The group said they were "appalled at the actions of these men" and encouraged witnesses to contact the local authorities, Billboard reported.
In a statement, they said they were "imploring anyone who witnessed this senseless act or has any information about the attack to please immediately come forward".
Mr Richardson's mother Gloria is also calling for the men to turn themselves in.
"It's not right that someone could go a concert for a good time and wind up dead," she said. "I want justice. Those two people need to be caught."
Police have not made any arrests and say they only have a vague description of the attackers.
Mr Richardson's friend Edgar Arellano said one man hit the victim on the head with his fist, knocking him head first onto the concrete.