The San Diego Chargers have signed former Green Bay Packers cornerback Casey Heyward to a three-year, $15.3 million contract, according to a league source. Heyward was the top cornerback stil available. Heyward had 65 tackles and seven pass breakups last season with no interceptions. Heyward is a former second-round pick from Vanderbilt. Follow me on Twitter: @AaronWilson_NFL Aaron Wilson covers the Texans for The Houston Chronicle.