I'm surprised there are that many from season 1 that are still alive actually. In all honesty, it's not too surprising that so many TMS guests are gone, because the show did start in the 70s and some of them were pretty old already at the time so that's natural unlike "Muppets Tonight!" where so far the only guest on that one that I know is deceased is Prince. (Correct me if I'm wrong on that). That is sad about Valerie though, but we knew for the past few years that her health was going downhill, so it's impressive that she was around for as long as she was.