Washington Redskins quarterback Alex Smith (11) celebrates with fans after an NFL football game against the Dallas Cowboys, Sunday, Oct. 21, 2018, in Landover, Md.

Former San Francisco 49ers quarterback Alex Smith, who made a remarkable comeback from an injury that nearly cost him his leg, announced Monday on Instagram that he is retiring from football.

Give him his due."He's (Smith) one of the most special people in my life," Nagy said. "What he did for that room, for Patrick, for myself, and coach (Reid) that year, we'll all never forget it. I ...