Seattle also released defensive tackle Sealver Siliga from the practice squad and signed defensive tackle D'Anthony Smith in his place.
Williams signed a future contract with Seattle on Jan. 31 and played in four games.
The Seahawks (4-0) are at Indianapolis on Sunday.
More Sports Headlines
Big humpy run forecast by experts Seahawks' Chancellor reportedly seeking more money, may hold out M's trade Ackley to Yankees in 3-player deal 3:56 p.m. UW coach Petersen not looking forward to Boise return Jetsí Richardson facing charges for resisting arrest 6:12 p.m. Bills place Williams on active/not-football injury list 6:02 p.m. Brady lawsuit transferred from Minnesota to New York court 6:02 p.m. Bills coach Kromer pleads not guilty to battery 6:02 p.m.
Our new comment system is not supported in IE 7. Please upgrade your browser here.