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Louis Walsh has determined to depart expertise present The X Factor after what he has described as 13 "fantastic" years.
Walsh, 65, has been the present's longest-serving decide, showing on all however one version because it started in 2004.
Production firm Thames thanked him for taking part in a "huge part" within the present's success.
Simon Cowell will return to the present for the upcoming collection, together with three new judges, whose identities haven't but been introduced.
"The show needs a change and I'm ready to leave," mentioned Walsh in an assertion.
He also stated that he would stay a decide on Ireland's Got Talent, in addition to focusing extra on "my day job as a manager, writing my memoirs and seeing the world".
Amelia Brown, managing director of Thames, mentioned: "His contribution can't be overstated.
"We would like to thank him for all he has given to the show over the years and look forward to continuing to work with him in the future."
Sharon Osbourne could have a lowered function within the present when it returns for a 15th collection later this 12 months, showing as a decide solely through the stay episodes, skipping the audition course of.
"I can't wait to get back to the judges' desk," she mentioned. "I love the new format."
Ms Brown added: "This is the start of a new era for The X Factor. I am really excited about all the ideas we have for the coming series including, of course, the new judging panel."
Judges' auditions for the X Factor 2018 will happen at Wembley Arena in London and beforehand marketed auditions in Liverpool will now happen on the venue within the capital.
More than 30,000 contestants have already entered the 2018 collection after open auditions throughout the nation.