Kirk Morrison is still out there and it's almost shocking that he hasn't been signed by a team yet. Surely there are teams out there that need a linebacker who is almost guaranteed to get over 100 tackles.
Morrison isn't completely past his prime, enough to not be considered as an addition to a team in need. He's only 29 years old and could still be productive.
When he gets signed is still up in the air, but why he hasn't been signed is the real question.