Thomas Herrion, a 23-year-old member of the San Francisco 49ers football team collapsed in the locker room and died earlier today, following a pre-season game against the Broncos at Denver's Invesco Field.

Herrion, a 6-foot-3, 310-pound guard, was on the field for San Francisco's 14-play, 91-yard drive that ended with a touchdown with 2 seconds left. Players had finished listening to coach Mike Nolan address them in a postgame meeting when Herrion collapsed. Medics administered CPR on him and took him to an ambulance that rushed him to a nearby hospital. About three hours later, 49ers spokesman Aaron Salkin confirmed that Herrion had been pronounced dead. The cause of death was not immediately known.