King played for the Lions in 2009 and was released during the final round of roster cuts before the 2010 season. He landed in Cleveland during the 2010 season, but the Browns released him shortly after. Once on waivers, the Lions claimed King, bringing him back in order to help with cornerback depth for the final few games of the season.
After being brought back toward the end of last season, King still had a year left on his deal, which was worth $640,000. By releasing him, the Lions give King the chance to sign with another team before the CBA expires on March 4. There isn't expected to be a ton of roster movement with signing guys right now because the CBA is likely going to expire, but if King catches on somewhere, he can get a deal done before the impending lockout.