By Andrew Gould The Indianapolis Colts hired former head coach John Fox as a senior defensive assistant coach. Fox has not worked in the NFL since serving as the Chicago Bears head coach in 2015. He previously spent nine years with the Carolina Panthers and four with the Denver Broncos under the same role. Before getting his first head-coaching opportunity in 2002, Fox worked as a defensive coordinator for the Raiders and New York Giants. The 67-year-old has plenty of experience for an assistant job. Colts owner Jim Irsay welcomed Fox to the team on Twitter. Fox isn’t the only former head coac…