The family of former NFL star Aldon Smith is donating his brain to the Boston University CTE Center to research the long-term effects of repetitive brain injuries following his sudden death at age 36

Former NFL star Aldon Smith died at 36. The cause of death has not been released by authorities or family.

Former NFL pass rusher Aldon Smith, known for his dominant talent and troubled career, has died at age 36. The San Francisco 49ers announced his passing, remembering his…