Here is the team's release issued a few minutes ago:
The Seattle Seahawks have released running back Justin Forsett, receiver Jordan Kent and punter Ryan Plackemeier, the team announced this afternoon. The team also placed receiver Nate Burleson on injured reserve and signed punter Jon Ryan to replace Plackemeier on the roster.
Ryan spent two seasons in Green Bay where he punted in 32 games, averaging 44.5 yards per punt. Prior to his stint with the Packers, he punted for two years with the CFL's Winnipeg Blue Bombers.