Police are searching for details about a fight at Angels Stadium on Monday night that led to the death of a Buena Park man.

About 8:45 p.m. Monday, as crowds were leaving the stadium after the Angels' opening-day game against the Oakland As, witnesses saw 27-year-old Brian Powers fighting with another man near a stairwell in the right-field pavilion, according to the Anaheim Police Department.

During the fight, witnesses said, a third man approached Powers from behind and punched him in the head, making him fall and strike his head on a concrete step. Powers was rushed to UC Irvine Medical Center, where he was pronounced brain dead around midnight Tuesday, said Anaheim Police Sgt. Rick Martinez.

"We're asking the public's help to find out what the fight was about," Martinez said.

The male suspects, who fled before police arrived, are described as being between 25-30 years old with goatees. Police are reviewing security videos that may have captured the attack. Witnesses are asked to call Anaheim police at (714) 765-1944.

-- Christopher Goffard