ANAHEIM, Calif. — A man involved in a fight at Angel Stadium on opening day has died.

Police say the 27-year-old man, whose name was not immediately released, died Wednesday at a hospital.

Witnesses told police the man was fighting with someone during the Angels-Athletics game on Monday when a third person came from behind and punched the victim in the head. The man then fell and hit his head on a concrete step near a stairwell.

Police are unsure what led to the fight and who started it. Investigators are reviewing surveillance video.

No arrests have been made.