The 49ers have signed 28-year old linebacker Matt Wilhelm.  Wilhelm played in all 16 games for the Chargers last season and he made 51 tackles, defensed 3 passes and he had 1 interception.  He has now played in 71 games in his six year NFL career and he has made 220 tackles, has defensed 12 passes, has 2 sacks, 1 forced fumble and he has 6 interceptions.  Wilhelm will replace linebacker Jeff Ulbrich on the roster who has been placed on the Injured Reserve List ending his season with 1 whole tackle.