Detroit is signing Wonnum to a one-year contract worth up to $6 million, Tom Pelissero of NFL Network reports.
Wonnum spent the past two seasons with Carolina following four campaigns with the Vikings. He started 37 of his 39 regular-season games over the past three seasons, recording 15.0 sacks and 10 defensed passes. Wonnum could compete for a starting job with Detroit, though such a role isn't guaranteed.