Huddersfield Town have parted company with manager Peter Jackson with immediate effect after his contract was terminated by mutual consent.
Jackson was in his second spell with the Terriers and helped the side clinch promotion from League Two after returning to the club in June 2003.
However, Town are currently struggling in the bottom half of the League One table and the 5-1 defeat at Nottingham Forest proved to be the final straw for the board of directors.
A statement on the club's official website read: "The board's clearly stated minimum aim at the start of the season was to achieve a play-off position, but unfortunately due to our form and the inability to attract key players, this objective is now looking remote.
"The board is ambitious for this great club and is committed to taking it forward as dynamically as possible and we have therefore regrettably had to part company with Peter.
"Peter made a major contribution to the club as it emerged from administration and helped us achieve our early successes.
"We would like to thank Peter most sincerely for his services over the last three- and-a-half years and wish him all the best for the future."
Academy manager Gerry Murphy has been appointed caretaker boss at the Galpharm Stadium.