Williams left the Titans to become head coach of the Buffalo Bills in 2001 before becoming defensive coordinator with the Washington Redskins from 2004-07. He also was defensive coordinator in Jacksonville in 2008 before being hired by the Saints in 2009.
Williams also has a relationship with Munchak's current defensive coordinator, Jerry Gray. When Williams left for Buffalo, Gray went with him and served as Williams' defensive coordinator with the Bills.
Even though Gray currently has the job, the Titans' defense needs help and Munchak will be coaching for his job in 2013 after going 6-10 in his second season as head coach. One reason for the losing record was Tennessee's inability to stop anyone; the Titans set a franchise record allowing 471 points in 2012. The only change Munchak has made to his defensive staff was letting linebackers coach Frank Bush go and moving Chet Paralavecchio into the job from assisting with special teams.
In Williams' last season with the Titans, Tennessee ranked first in the NFL in fewest yards allowed, first in passing yards allowed and third in rushing defense. The Titans also set a franchise-record for fewest points allowed with 191 with an aggressive defense.