Tennessee quarterback Cam Ward spoke out Wednesday about threats directed at his family on social media, calling the behavior strange.
Current and former NFL players offered mixed reactions when asked whether they would want to know if they have the degenerative brain disease.
The family of the young footballer say the FA could have taken steps that would have prevented his death.
The NFL, NBA, MLB, NHL, MLS and their players' associations are pressing state gambling regulators to address a rise in harassment and violent threats directed at athletes by sports bettors.