Jimmy Johnson, who won two Super Bowls and a national college championship as a coach, just announced his retirement from Fox Sports after being a part of its NFL coverage for 31 years. The 81-year-old Johnson made the announcement yesterday during an appearance on The Herd With Colin Cowherd. "The most fun I ever had in my career, that's counting Super Bowls and national championships, was at Fox Sports," he said. He added that he loved working for CEO Eric Shanks and Fox NFL Sunday producer Bill Richards. "But I've made an extremely difficult decision," Johnson said. "I've been thinking about it for the last four or five years, and I've decided to retire from Fox. I'm going to miss it. I'm going to miss all the guys. I'll see them occasionally. It's been a great run starting 31 years ago."