The San Francisco 49ers are losing a major force in the middle. Adam Schefter is reporting that stud defensive tackle Justin Smith will retire.
49ers' DT Justin Smith is retiring, sources tell @JimTrotter_NFL. Great player, big loss, in many ways.
— Adam Schefter (@AdamSchefter) May 18, 2015
Smith earned an All Pro nod in 2011, 2012 and 2013 while playing injured for the bulk of those seasons.