Jon McGraw

What in the Blue Blazes happened to Jon McGraw on Sunday?  Can anybody tell me?  I've looked everywhere and can't find anything about an injury or anything.  I watched the second half of that game and S.Piscitelli was playing in his spot.  He started the game because he got one assisted tackle.  I lost by a very slim margin so this burnt me bad.  Any answers to this mystery would be much appreciated.  Thanks!

I "heard" from someone who saw the game that he had a knee injury, but I haven't seen it reported any where.

For more on McGraw, you can read my latest waiver wire article: http://www.idpguru.com/2011/09/2011-idp-waiver-wire-pickups-week-4.html