Chris Borland Retires

Worried about head injuries, San Francisco 49ers linebacker Chris Borland is leaving football. Not even the promise of stardom and piles of money could change his mind.

After one outstanding rookie season, Borland is retiring at age 24.

The 49ers announced his decision Monday night, without offering an explanation. Earlier in the day, however, Borland told the ESPN television program "Outside the Lines" that he wants to do "what's best for my health."

There is increasing evidence that the repeated blows to the head football players sustain can lead to memory loss, headaches, confusion, moodiness and other serious symptoms. Damaging blows to the head, or concussions, are common in football and several other contact sports. Players often recover fully from a single concussion, yet multiple concussions can sometimes lead to permanent brain damage, behavioral problems and depression.