A scene from “Unfinished Business”

Marian Simpson: [after Jessica exposes her as the murderer] You think you've got it all figured out. But you didn't know what it was like coming from nothing, being shoved from one foster home to another till you finally wind up here in this crummy convent.

Jessica Fletcher: But marrying Albert Simpson changed all that.

Marian Simpson: It made me someone. And I wasn't about to let any stupid mistake that he made fifteen years ago take all that away.

Jessica Fletcher: So you killed the only person who might have been able to expose your husband's secret.

Marian Simpson: I had to. Albert never would've done it! All he did was drive around all night trying to think things through. I didn't need to think! I knew exactly what to do. I hadn't counted on her having company during meditation hour. But once I knew that she was alone, it all seemed so easy. Everyone knew Sister Emily's been taking Metolital for years. All I had to do was ... I emptied her pills into my pocket. I even remembered to bring along an old piece of Scripture that she'd copied for me years ago to leave as a note. But by then, it was nearly 11:00, so, I disguised myself in this habit. And then I took the photograph, and I left. It was nearly perfect. Until you started to interfere.