Jack Ross has been sacked as manager of League One club Sunderland.
The Black Cats are sixth in the third tier, four points behind second-placed Wycombe Wanderers.
Ross took over at the Stadium of Light in May 2018 and led the team to the final of the EFL Trophy and League One play-off final last season, losing to Portsmouth and Charlton respectively.
Sunderland chairman Stewart Donald told the club website: "This is a decision that has been made with a heavy heart."
Former Alloa and St Mirren boss Ross’s last game in charge of the Wearside club was Saturday’s 2-0 defeat at Lincoln City, with some travelling fans booing the team off the field at the end of the match.
Assistant Jamie Fowler will lead the team in Tuesday’s leasing.com trophy game against Grimsby.
"When we arrived at the club 18 months ago, we appointed Jack because we felt that he was the right man to take Sunderland forward over a number of years," Donald added.
"Jack has worked extremely hard, and has helped us achieve stability at the club, and I sincerely thank him for his efforts. I hope and believe that he will go on to have a successful career in management."