A host of celebrities have taken to social media to express their sadness at the news.
His Wham! bandmate Andrew Ridgeley posted these touching messages.
Heartbroken at the loss of my beloved friend Yog. Me, his loved ones, his friends, the world of music, the world at large. 4ever loved. A xx https://t.co/OlGTm4D9O6
— Andrew Ridgeley (@ajridgeley) December 26, 2016
Elton John shared a photo of his close friend.
Madonna paid her respects.