Charlton have announced the sacking of manager Johnnie Jackson only six months after his appointment as the club's permanent boss.
The Addicks announced the decision having finished their League One season on Saturday in 13th place, despite winning six and drawing one of their final 10 games.
Jackson took over the reins in his first permanent managerial role in October, stepping up to replace Nigel Adkins who he had served alongside as assistant, with the club 22nd in League One.
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A run of 20 points from nine games saw him appointed as permanent boss on a contract until the end of the season in December, with the club announcing would be 'automatically extended based on success on the pitch'.
Any hopes of a play-off push were dashed by six defeats from seven games in February and March, before the club recovered to end the season 19 points above the drop.
Charlton owner Thomas Sandgaard told the club website: "This decision has been a very difficult one to make, Johnnie has done so much for the club, but I felt the time was right to make the change as we continue our preparations for next season.
"Our search for a new manager has begun. This season wasn't the season any of us at the club wanted. I have big ambitions for Charlton and it will be important for us to find the right individual that can build on the foundations in place and help us progress on our journey."
Analysis: A move that could define Sangaard's ownership
Sky Sports' Charlotte Marsh:
"It was hardly the easiest season for Johnnie Jackson. Replacing Nigel Adkins following his departure in October - first on an interim basis and then permanently after nine wins in his 13 caretaker games - he steered Charlton away from a relegation battle and to a mid-table finish.
"There was also a squad blighted by injuries not long after Jackson took over. At one point, five forward players were unavailable - that would hamstring even the best sides in the world, but the players coming into those positions couldn't quite fill the same shoes.
"Jackson was joined by another club legend in Jason Euell in the dugout and although he won 19 points from his final 10 games, owner Thomas Sangaard clearly did not feel he was the right man to help push Charlton forward and up the leagues.
"Among the fans, many understand the decision, although that does not make it any easier to take. Jackson is a legend of the club that has helped steer the Addicks through some of their best and worst times.
"As a player, he took over Chris Powell's iconic 'tunnel jump' after a home victory and was part of the League One-winning side of the 2011/12 season under Powell. He was also a coach under Lee Bowyer when Charlton beat Sunderland in the final minute of the League One play-off final in 2019, running down the touchline to celebrate with his players.
"He also stuck it out during the dark days of Roland Duchatelet, which bought years of turbulence to Charlton. Not once did he jump ship, even when the club wasn't sure who owned the club at some points in 2020.
"It marks the end of an era at the club and whoever Sangaard appoints next has big shoes to fill, especially in terms of fan endearment. It remains to be seen if this is a good move, and it could be one that will come to define his ownership of the club. He wants Charlton back in the Premier League, and so do the fans.
"However, although the dream of Jackson leading Charlton back into the big time as manager has sadly been brought to an end, 'JJ' will always be a huge part of the club's history."