A scene from “Unfinished Business”

Kimberly Carson: [after Jessica accuses her of commiting the murder] First it was the awful things that Grandfather said about me in his will. I'd always loved Grandfather. And then I realized without the money that Preston would never marry me. Yes, I knew he was vain and self-centered, but I didn't care. And then Mother came in, and she said he was an impostor, and that he was using me. So I decided to kill myself. So I went down and I got the gun out of Grandfather's desk and I decided to do it in the pool house, because it was always just a very special place to me. I didn't mean to kill him. I didn't mean it.

Jessica Fletcher: I know.