Kansas City Chiefs offensive coordinator Bill Muir has told the team that he is retiring, according to ESPN.com.
"It has been an honor to be a part of this great league for so long," Muir said in a statement issued by the Chiefs. "Over the years I've made a lot of great friends and worked with many talented players and coaches. This was a personal decision for me, the timing was right."
Muir, 69, joined the Chiefs in 2009 as an offensive line coach and was promoted to offensive coordinator last season.
Muir started his NFL career in 1978 as a scout for Tampa Bay and has also coached in Detroit, New England, Indianapolis and New York.
"I have a tremendous amount of respect for Bill," Chiefs general manager Scott Pioli said. "I have worked with him for a long time and have witnessed him develop a number of very good football players. His contributions are very much appreciated and he will be missed."