...as I decided to sweep most of my comments into a single post, in stead of replying separately to you, Tony, and so on.
Just FWIW, this was the first I'd ever heard of this particular conspiracy theory; I'd say the suicide story, the only one I'd ever heard/read before, is the canonical version.
But, hey, it doesn't even look all that improbable -- I'd always wondered why the heck he'd go and do that for.
So, I see you didn't rise to my (counter-)bait about soot?
Or is it just that you haven't, _yet_...? :-)