Yes, she is still alive and I have no idea why one website showed her dying in 1982. I looked further and see she is a very successful artist. Mrs. Kennedy purchased one of her paintings for the white house.
I never saw the show but a couple of times. We didn't get a tv until 1954 when I was 12 going on 13 and the one channel we got was on a different network. I was a ( and still am ) a fan of Ricky's music. I haven't seen anyone mention Ricky's daughter, Tracy. She's an actress and played on the Father Dowling Mysteries. I really liked that show.
When I was googling info on her mom, I saw and was reminded of Tracy. She is pretty and very talented. I've never watched Father Dowling so I didn't know she was on there.
Yes, Kris Nelson is still alive. Also, if you ever saw Adam-12, for awhile she had the role of Officer Reed's wife. Kris/Ricky's daughter Tracy battled multiple cancers, I think she's still an actress, though.