Peterson signed with Seattle on Thursday. His release clears roster room for newly acquired defensive lineman Kentwan Balmer.
His boomerang stay continues a pattern of roster turnover that new coach Pete Carroll has had since he arrived in January.
Seattle also released linebacker Alvin Bowen and signed kicker Clint Stitser to the 80-man training camp roster.
Stitser was out of football in 2008 and '09. The former Fresno State kicker was most recently with the New York Jets. He is in camp to help reduce the workload of Olindo Mare. The Seahawks' franchise-designated player for 2010 has been kicking with a sore calf this month.