Why did Kay ask Jonathon to stay late? It only added risk to getting caught. If it was to throw anyone off from thinking it was her, they never touched on that point. It served more risk than benefit to her.
I've wondered about that, and I came up with an explanation that seems to make sense. She needed someone to hear the shot, so that the time of death would be known with certainty, which would strengthen her alibi. What do you think?
Yes, that makes sense completely. Puts the time of death at the exact time she was supposedly making the changeover. Still risky, but makes sense. Thanks Clay! By the way, you have the best name - Make Me a Perfect Murder my favorite episode.