Shaughnessy started all 16 games in 2012 and posted 3.5 sacks and 31 tackles. He bounced back from a shoulder injury that landed him on injured reserve in 2011.
The Cardinals get a solid contributor on the line who holds up well against the run and can rush the passer. Shaughnessy had 56 tackles and seven sacks in 2010, but isn't considered a sexy signing.
The one-year deal allows Shaughnessy to test the market again next year, in hopes of better results.
Follow Kareem Copeland on Twitter @kareemcopeland.