The family of former NFL star Junior Seau will donate his brain for research into repetitive head injuries. San Diego Chargers chaplain Shawn Mitchell says the family made the decision Thursday. Seau, a standout USC and Chargers player, was found dead Wednesday at his Oceanside home. An autopsy concluded he shot himself in the chest. Some have speculated that brain injuries from football may have played a role in his death, but there's been no medical confirmation of such damage. His family and hundreds of people held an impromptu memorial for Seau on Thursday night outside his home.