Former UCLA players Clark and McNeill participated in a UCLA study . The protein tau , linked to a brain disease , was found in both of their brains . McNeill , 60 , has been diagnosed with early stage dementia , while Clark , 65 , is cognitively normal . Fred McNeill has early-stage dementia ; McNeill does not . Researchers say other variables may come into play when it comes to the disease .
Former UCLA players Clark and McNeill participated in a UCLA study . The protein tau , linked to a brain disease , was found in both of their brains . Fred McNeill has early-stage dementia ; McNeill does not . Researchers say other variables may come into play when it comes to the disease .