The 49ers have signed 29-year old DE Demetric Evans.  Evans played in all 16 games for the Redskins last season and he made 33 tackles, defensed 2 passes and sacked the QB 3.5 times.  He has now played in 96 games in his NFL career and he has made 147 tackles, defensed 11 passes, has 13 sacks and he has forced 3 fumbles.  Evans should provide some quality depth at DE for the 49ers in 2009.