The Denver Broncos have signed 23-year old RB Darius Walker to a 2-year deal.  It seems as if the Broncos are collecting RBs this off-season so it will be hard for Walker to get his hands on the ball much in 2009.  Walker last played in the NFL in 2007 with the Houston Texans.  He has played in 4 games in his NFL career carrying the ball 58 times for 264 yards (4.6 ypc) with 1 TD run.  He also caught 13 passes for 81 yards (6.2 avg) in his career.  Walker has talent but he will be buried on the depth chart heading into the 2009 season.