In early 2004 Susan Dey made her final onscreen appearance before retiring with a featured role on the NBC drama Third Watch. Billed as special guest star, Susan Dey plays Dr. Breene, a department psychologist sent to interview and subsequently console members of the cast following the traumatic death of a coworker. I'll have to admit that I haven't sat down and watched this. However, I thought it was important to include some information on this because it was the last thing Susan Dey did (unless she decides to come back and do something else!).
Take a look at some images of Susan Dey on Third Watch: