Although not proven, I believe OJ was suffering from CTE when he became estranged from Nicole. His last two seasons as a running back, he lost his explosive first step. He could no longer spin and evade tackles like he once could. As such, opposing defenses started to safety blitz him, Safeties may not be the biggest players on the gridiron but they hit the hardest. Every time he carried the ball he was taking multiple hits. I still remember the year the Denver Broncos first went to the Super Bowl. OJ was playing for the 49ers, he got brutally punished by the Orange Crush, I was amazed that he managed to walk off the field.