The team announced the deal on Tuesday morning. Wilkerson spent last season with New Orleans, but his best seasons came in 2008 and 2009 with Tampa Bay when he worked with new Seattle defensive line coach Todd Wash. Wilkerson started a career-high 15 games in 2009 and had career bests in tackles (46) and sacks (6).
Wilkerson will likely serve as a rush defensive end in passing situations.
He's the second defensive free agent to reach a deal with Seattle in as many days. The Seahawks brought back cornerback Kelly Jennings on Monday.