http://www.rototimes.com/nfl/player.php?tqid=7734&type=news&nid=65629
Here is some more information on him:
http://en.wikipedia.org/wiki/Kory_Sheets#Professional_career
San Francisco 49ers' beat writer Matt Maiocco is reporting on Twitter that practice squad running back Kory Sheets has been picked up by the Miami Dolphins. The Dolphins had an opening after they found out Patrick Cobbs is out for the season.
Our View: Sheets was in the locker-room packing up his things, so it looks like he is on his way out. Running backs seem to thrive in Miami, so this could end up being a great move for him. Don't expect him to play much, but the rookie could learn a lot from guys like Ronnie Brown and Ricky Williams.
Here is some more information on him:
http://en.wikipedia.org/wiki/Kory_Sheets#Professional_career