(Renton, WA)  --  Former starting center Drew Nowak is among five players who have been waived by the Seattle Seahawks.  Nowak started seven games at center last season before Patrick Lewis took over the job.  Also gone from the team are running back Cameron Marshall, tight end Ronnie Shields, defensive end Josh Shirley, and receiver Tyler Slavin.  The Seahawks made the moves to make room on the roster for players drafted and signed as undrafted free agents last week.