Aldon Smith's final moments revealed in 911 tape aftermath

Aldon Smith, former linebacker for the San Francisco 49ers, died on June 13 at age 36. A 911 call released by the Chronicle details frantic attempts to revive him after he lost consciousness in a parked pickup truck outside a friend's home in Los Gatos. His companion, Amir Shirazi, reported that Smith fainted after they had delivered pizzas to a charity. The cause of death is unknown pending an autopsy, and Smith's family plans to have his brain assessed for chronic traumatic encephalopathy. The situation has drawn attention to the challenges faced by former NFL players after their careers end.

• 4:51 AMYahoo Sports — Aldon Smith ‘won't wake up': 911 tape reveals frantic final moments of 49er's life