Christa Helm in "Beauty on Parade" Ep.
I just found the first season on DVD in my armoire after I thought I had lost it forever. While watching Beauty on Parade I remember that one of the beauty contestants had been murdered in real-life, but I couldn't recall which one it was. After searching I discovered it was Christa Helm who played Rita. It was said this was her last acting role before she died.
I remember seeing something about her murder on one of the tabloid shows years ago and that she was once on a Wonder Woman episode. They never found out who her killer was either, only that it was a woman, and that was all they knew through DNA.