IIRC....I heard he released a statement about a situation during that time when his plane was in a near-accident. He said that during that time, bags started falling on his head.
It's speculation (obviously), but I really think that that would be a possible explanation for his untimely demise.
Here is the exact quote from the man, the myth and the legend:
"All of a sudden as we hit, you know it was just the hardest hit. The things from the ceiling started dropping and it hit me on the head, but I got a hard head."