At the moment that Jessica figures out who the murderer is, a light bulb comes on above her head.
Dame Angela Lansbury and guest Michael Callan both passed away within a day of each in October 2022; Callan on the night of the 10th, Lansbury in the early hours of the 11th.
William Atherton's second appearance. He was previously featured in Season 2, Episode 3, "Murder in thy Afternoon."