To explain my incorrect answer, the unlucky Mrs. Petrie.

I thought it was Antoinette Bower, Frances Galesko in "Negative Reaction". She was Dick Van Dyke's wife, that he murdered. Van **** was Rob Petrie on "The Dick Van **** Show". That photo looks a lot like Bower in her youthful days.

Thanks, Simon -- it got my interest, but I was stumped!

I was also intrigued, but stumped. I maybe would have guessed Antoinette Bower. Thank you, Simon, for sharing this with us!