Carolina Panthers reportedly won't franchise tag DeAngelo Williams

It appears running back DeAngelo Williams' days are numbered in Carolina, this after the Panthers reportedly decided not to use their franchise tag on the six-year back.

League sources told ESPN NFL Insider Adam Schefter that Williams will become an unrestricted free agent and could potentially leave the Panthers.

Williams, who turns 28 in April, was sidelined much of 2010 with a foot injury. He managed only 361 yards and one touchdown last season.

According to ESPN, the Panthers will tag either center Ryan Kalil or defensive end Charles Johnson.