Also, did they all die or did any guest star on the show?

I don't know all the answers but I think she was married four times. Walter was the fourth.

Hm you had Carol's father Barney (I think), who died; Chester (who appeared in the s5 episode "Maude and Chester" and got locked up with Maude) and Albert, who wasnt seen but died in the ep "Poor Albert" from season 4.