A second teenager died from injuries he suffered when fans crowded around the stage at Friday night's rock concert, while a third person remains in critical condition at a Salt Lake hospital.

Curtis Child, 14, Logan, died at 2:45 p.m. Sunday at Holy Cross Hospital, a hospital spokeswoman said. Elizabeth Glausi, 18, Provo, remains in critical condition.Killed during the performance of the heavy metal band AC/DC was Jimmy Boyd, 14, 1501 S. 400 East, Salt Lake City.

An autopsy performed Saturday determined that Boyd died of asphyxiation, police said.

The injuries occurred when the victims were sandwiched within a crushing crowd of fans on the main concert floor in the Salt Palace's Acord Arena. The deaths are the first to occur at a Utah rock concert.

The push of the crowd became so violent that the concert was stopped for about 15 minutes while a chain of officials tried to restore order. Teenagers were pulled out of the fray and passed overhead out of the crowd.

When the concert began again, security guards threw gallons of water on the crowd in an effort to quell rising temperatures estimated at 100 degrees.

Another concertgoer, Larry Mitchell, 25, suffered head injuries in an unrelated accident at the concert, when he tried to jump from a stairway to an escalator outside the arena. He slipped and landed in a fountain, police said. Mitchell was admitted to LDS Hospital in satisfactory condition but has been released, a spokeswoman said.