It's been revealed that the singer died of heart failure in his sleep on Christmas. 

He was a regular at midnight mass at a church near his home, but he was a no-show this weekend. His reps say that he wasn't ill at the time of his death, and was working on a movie with Showtime.

The photos above were taken in September, where it was revealed that Michael was struggling with his weight. He had become reclusive in the last few months of his life.

We'll be playing his music throughout the day today. Rest In Peace, George.