I was trying to think of which rock bands have no current living members.
The Ramones is the one that comes to mind. Also, I know the original three members of Motorhead are deceased, although they did have a lot of band members since then who are still alive.
Many have just one or two, like 1 Dog Night.
Lemmy Kilmister may have been one of the few whose health actually improved thru smoking, drinking and drug use.