I don't know about the mysterious part...between the skin bleachings, countless surgeries, flaming hair, hyperbaric chambers and who knows what combinations of pharmaceuticals he subjected himself to over the past few decades, I'd say the only big mystery is how he managed to survive as long as he did.
What I find strange is why his "personal physician" was already at the home trying to revive him when the paramedics came.
Heart attack my @. No doubt in my mind he OD'd. Probably too much oxycontin. The 50 year old wacko -Jacko was after all, trying to become the dancing whiteboy wonder again for his final tour. That had to of been hurting.
A lot of black and white people suffer from this.