Norwood, a third-round pick in 2006, had only 76 carries for 252 yards and no touchdowns in 2009. He had head and hip injuries and was inactive for six games.
In four seasons, Norwood has 1,987 yards rushing and seven touchdowns. He ranks third in team history with 2,987 yards on kickoff returns.
Koenen averaged 42.6 yards on 61 punts last season, his sixth with the team. He also was the team's kickoff specialist.
Backup tight end Jason Radar, who made one start in 2008, announced his retirement.