Nov 19, 2009; Charlotte, NC, USA; Carolina Panthers running back Jonathan Stewart (28) runs as Miami Dolphins cornerback Sean Smith (24) defends in the first half at Bank...

Carolina Panthers running back Jonathan Stewart (28) runs against the Tampa Bay Buccaneers during an NFL football game at Bank of America...

Carolina Panthers' Jonathan Stewart (28) runs during the team's NFL football training camp in Spartanburg, S.C., Thursday, Aug...

Carolina Panthers running backs DeAngelo Williams (34) and Jonathan Stewart (28) are shown during the team's NFL football training camp in Spartanburg, S.C., Wednesday...

Carolina Panthers' Jonathan Stewart (28) runs past Tampa Bay Buccaneers' Geno Hayes (54) and Barrett Ruud (51) in the second...

Carolina Panthers' DeAngelo Williams (34) and Jonathan Stewart (28) celebrate William's second touchdown during their 34-0 win over the Kansas City Chiefs...

Jan 10, 2009; Charlotte, NC, USA; Carolina Panthers running back Jonathan Stewart (28) celebrates scoring a touchdown against the Arizona Cardinals during the first quarter of the NFC...

...Mandatory Credit: Jerry Lai-US PRESSWIRE Dec. 8, 2008; Charlotte, NC, USA; Carolina Panthers running back Jonathan Stewart (28) runs in the third quarter as Tampa Bay Buccaneers defensive tackle Ryan Sims (98) defends...

...Carolina Panthers CHARLOTTE, NC - OCTOBER 5: DeAngelo Williams #34 of the Carolina Panthers celebrates with teammate Jonathan Stewart #28 after one of his three touchdowns against the Kansas City Chiefs at Bank of America...

Carolina Panthers' Jonathan Stewart (28) gets taken off his feet by Tampa bay Buccaneers defenders Quincy Black (58) and Will...

Dec. 8, 2008; Charlotte, NC, USA; Carolina Panthers running back Jonathan Stewart (28) celebrates his fourth quarter touchdown with running back DeAngelo Williams (34) at Bank of America...

CHARLOTTE, NC - DECEMBER 08: Jonathan Stewart #28 of the Carolina Panthers celebrates with teammates after scoring a touchdown against the Tampa Bay...

Carolina Panthers running back Jonathan Stewart (28) scores a touchdown as Minnesota Vikings linebacker Chad Greenway, right, attempts to make the stop...

...Herrera (64), Ryan Cook (62) and Bernard Berrian (87) during a game against the IndianapolisCarolina Panthers' Jonathan Stewart, left, runs for a touchdown as Chicago Bears' Brandon McGowan (36) defends during the third quarter...

Running back Jonathan Stewart #28 of the Oregon Ducks runs upfield in a 16-0 loss to the UCLA Bruins...