Former Rams head coach Steve Spagnuolo has agreed to become defensive coordinator of the Saints, sources told ESPN senior NFL analyst Chris Mortensen. The 52-year-old Spagnuolo was head coach in St. Louis the past three seasons/ Before that he was defensive coordinator for the Giants, a stint that included a Super Bowl upset of the Patriots. NFC South blog ESPN.com's Pat Yasinskas writes about all things NFC South in his division blog. • Blog network: NFL Nation Gregg Williams, who was New Orleans' defensive coordinator the past three seasons, has joined Jeff Fisher's staff in St. Louis. Spagnuolo and the Saints do not have a contract yet.