We're down to three unsigned draft picks

On the final day of May, NFC North teams are nearing completion of negotiations with their 2012 draft class. The latest agreement is between the Minnesota Vikings and safety Harrison Smith, according to multiple reports. Here's an division-wide update:

Chicago Bears: Draft class signed.

Detroit Lions: First-round offensive lineman Riley Reiff is only unsigned rookie.

Green Bay Packers: Draft class signed.

Minnesota Vikings: First-round offensive lineman Matt Kalil and third-round cornerback Josh Robinson remain unsigned.