When Justin Smith decided that his body wouldn't let him perform up to his own lofty standards, he knew it was time to stop playing. Smith announced Monday that he is retiring after 14 seasons as one of the top defensive linemen in the NFL, dealing yet another blow to the San Francisco 49ers in a rough offseason. One of the most durable players at one of the most physically demanding positions, Smith had been hampered the past two seasons by a bum left shoulder that he first hurt in training camp in 2013. More...