Dead Letter - S6-E6
Factual error: Unlike the Connie Kowalski character in this episode, real insurance investigators are not trained in arson investigation. Insurance investigators search for evidence of fraud relating to insurance claims. Arson investigators are professional firefighters who have had extensive additional training in arson investigation.
Answer: Because during Season 6, Lansbury wanted a lighter workload and to do other projects. So they had her just introduce and sum up the episode.
Rob245