That is exactly where I got the info from. I see what you are up against.
Have you tracked down the next couple of census'? That would give you an idea of if/when and where he died. If you can find that there is a posibility of a death notice/article in a local paper. It should list his immediate family and Susan's married name if she has one. Next of kin/purchaser of the plot would probably be Sarah Jane.
You have probably already done this but just in case.