San Francisco 49ers lineback , Chris Borland caused sensation by quitting . Revealed he told his parents in a letter his health was more important . Walked away from $ multi-million dollar contract after only one year . Worried about evidence linking concussions to neurological damage .
San Francisco 49ers lineback , Chris Borland caused sensation by quitting . Revealed he told his parents in a letter his health was more important . Walked away from $ 3million contract after only one year . Worried about evidence linking concussions to neurological damage .