"Bill Muir coached in the NFL for 30 seasons and was planning for a 31st, this one as the Chiefs' offensive line coach.

The 69-year-old Muir had an abrupt change of heart this week. On Wednesday, he walked into the office of Chiefs head coach Romeo Crennel and said he was retiring from the Chiefs and from football.

"I feel badly because they want me to stay," said Muir, who joined the Chiefs in 2009 as offensive line coach and also served as coordinator last season. "I'm not leaving because of anything that has gone on or is going on or will go on with the Chiefs. This is a personal decision. It's very personal. I've been denying myself a lot of things over the years, but I'm at a point in my life where I want to do some other things."