Ted Roof was fired on Thursday as defensive coordinator and linebackers coach at Oklahoma, following a season in which the Sooners' defense started strong but struggled down the stretch. Sooners coach Brent Venables said in a news release that he told Roof he was being let go as defensive coordinator, and that Roof declined an offer to remain on the staff in a different role. Oklahoma made significant improvements this season, Roof's second with the Sooners.