Instagram he was leaving the show after five years. But the decision for his exit was made after the most recent series of both civilian and Celebrity SAS was filmed.
His final 12 celebrity recruits will be seen on screen for the first time tonight - with Kerry Katona, Jake Quickenden, Ulrika Jonsson and James Cracknell among those taking part.
In the first episode alone, he puts them through mental and physical agility tests including dealing with a tear gas attack.
Read more on msn.com