Chesterfield manager Roy McFarland has left the struggling League One outfit.
McFarland took over as manager in June 2003
McFarland, who had been in charge at Saltergate for nearly four years, leaves the club just a point above the relegation zone after a poor run.
He is replaced by Lee Richardson, who will be the club's caretaker-manager until the end of the season.
Chairman Barrie Hubbard said: "Roy has helped return respect from the football world and we thank him for that. But Lee deserves the chance to take over."
Hubbard added: "During my long involvement with the club I have made a number of mistakes, but appointing Roy McFarland as manager was not one of them.
"He helped a club recovering from the shenanigans of a previous regime.
"Lee has been a loyal assistant to Roy and has worked hard to achieve the relevant qualifications and now has his opportunity."
Richardson will work with the Spireites current backroom staff, with additional support from the club's 38-year-old striker Wayne Allison.
Chesterfield have lost their last four matches and have only nine games to save their League One status.