heisman trophy winner and former nfl all-pro bo jackson said in a 2017 interview with "usa today" that if he had known about the risks associated with cte, he would never have played football, and he discourages his children from doing so. in late 2017, former kansas city chiefs running back larry johnson reported having symptoms akin to aaron hernandez, including memory blanks, suicidal thoughts and thoughts of committing violent acts. although there is no way to positively diagnose cte before death, johnson believes he is living with the disease.