Dallas Cowboys running backs Skip Peete has been relieved of his duties by coach Jason Garrett and will not return for the 2013 season, according to a source.Peete, who had been with the Cowboys since 2007, was informed in a meeting with Garrett on Monday.Peete was surprised by the move, given the injuries to running backs DeMarco Murray the past two seasons, and the struggles on the line to open holes for the running game, according to the source.The Cowboys set a team record for fewest rushing yards in a 16-game season in 2012 with just 1,265.Murray rushed for 663 yards, the lowest for a Cowboys leading rusher in 23 years. He missed six games with a sprained foot.A disappointed Garrett hinted at changes with the running game in his news conference after the season-ending loss at Washington."We have to do a better job running the football," Garrett said.Peete is the first change, but he might not be the only staff move.Special teams coach Joe DeCamillis interviewed for the Chicago Bears' head coaching job Saturday. If he doesn't get the Bears job, he could be in line for a lateral move to another team. The Cowboys blocked a potential move by DeCamillis to the Oakland Raiders last season.The Cowboys have yet to rule on the future of defensive coordinator Rob Ryan. Garrett and owner Jerry Jones refused to guarantee his return during interviews last week.Cowboys sign nineWide receiver Anthony Armstrong is back with the Cowboys.Armstrong was one of nine players signed to the Cowboys' reserve/future list on Monday.He joins tight end Colin Cochart, guard Ray Dominguez, wide receiver Jared Green, long snapper Charley Hughlett, wide receiver Carlton Mitchell, linebacker Cameron Sheffield, tackle Aderious Simmons and cornerback Brandon Underwood.Armstrong, who attended Carrollton Smith High School, signed with Dallas on Nov. 26 and played in one game. He was released on Dec. 22.