The brain of former Kansas City Chiefs linebacker Jovan Belcher -- the 25-year-old player who shot and killed his girlfriend in 2012 before committing suicide hours later -- showed signs of pervasive brain damage like that found in other deceased NFL players, according to a neuropathologist. In a report obtained by "Outside the Lines," Dr. Piotr Kozlowski writes that he detected neurofibrillary tangles of tau protein, which is identified with chronic traumatic encephalopathy.