Brighton & Hove Albion have confirmed that Chris Hughton has left the club with immediate effect.
Hughton had been in charge of Brighton since the end of 2014 and guided the club to the Premier League in 2016/17.
They finished 15th in their first PL season and they ended in 17th position in this campaign, one place and two points above the bottom three.
"Chris has done an excellent job over the past four and a half years," club chairman Tony Bloom told Brighton's official website.
"First stabilising our club, reaching the playoffs in his first full season, securing our first ever promotion to the Premier League, and retaining our status in two successive seasons.
"Undoubtedly, this has been one of the most difficult decisions I have had to make as chairman of Brighton & Hove Albion, but ultimately one I have made due to how we struggled in the second half of the season.
"Our run of three wins from 23 Premier League matches put our status at significant risk. It is with that in mind, and the performances during that period, that I now feel it's the right time for a change."
Hughton's assistant Paul Trollope and first-team coach Paul Nevin have also left the club.