This is the converse of that. With the recent passing of Tommy Ramone, all the founding members of The Ramones are now deceased.
What other bands have seen all their founding members run down the curtain and join the choir invisible? To keep this from being a laundry list of bands from the 30s and 40s, I’m limiting responses to bands that were formed in the 60s or later.
Tyrannosaurus Rex. They were only two people to begin with, but not only are both original members dead, but also both members of the second lineup, and only the drummer from the third (quartet) lineup is still standing.