You're missing out. There's nothing like a good conspiracy.....but consider this...there were much bigger fish to catch than Urbie and considering his connections (and probably gambling debt), it seemed quite convenient for him to die during a somewhat minor surgery. And no one I can find to have claimed to have attended a funeral.
As to a different note, did you hear the one about the Queen, the Pope, and Buffalo Bill?.....well those aren't buoys!
Just my opinion, of course.