KSI, whose real name is Olajide Olatunji, has made football, comedy and challenge videos with the group - which has 23 million YouTube subscribers - since 2013. His spokesperson confirmed to the BBC that he was leaving, after many of his followers voiced suspicions that it was a stunt. The Sidemen said it "came as a surprise" but wished him well. Tap the link in @BBCNews’s bio to read more about his departure. #KSI #Sidemen #YouTube #BBCNews