A University of California-Davis basketball player collapsed during a game Saturday night and died slightly more than an hour later without regaining consciousness, sports information director Jim Doan said yesterday.

The cause of death was not known. The Yolo County coroner had scheduled an autopsy for yesterday, but postponed it until today.

Leon Richardson, 21, a San Francisco native and a starting forward, collapsed at about 9:30 p.m. in a game against College of Notre Dame. He was treated by four doctors and emergency personnel who administered cardiopulmonary resuscitation at the stadium. Richardson was taken to the Davis Student Health Center two blocks away, where Dr. Michael Gass pronounced him dead at 10:35 p.m.

Davis Coach Bob Hamilton had taken Richardson out of the game against College of Notre Dame with 8:53 remaining because, Doan said, Richardson "looked tired." Richardson sat on a chair next to his teammates for about a minute, then collapsed.

The game was discontinued by agreement of both teams, with College of Notre Dame leading, 75-71, Doan said. Hamilton was said to be "in shock" Saturday night along with his team, Doan said.

Richardson, a senior psychology major, started the first four Davis games this year, including Saturday's. Richardson attended San Francisco City College and Balboa High School in San Francisco, where he was student body president and twice was named to the all-city basketball team.