Murphy also talks to Kathleen Petersons sister, Candace Zamparini, who has been outspoken about her belief in Petersons guilt: It was very cathartic to say, ahh, this is what I fought for.
We werent quitting until we heard the word guilty. We thought we were going to hear it from another 12 jurors but we got to hear Michael say guilty.
The two-hour episode of Dateline, titled Down the Back Staircase, also features interviews with Petersons daughters Martha and Margaret Ratliff, his brother Bill Peterson, Durham detective Art Holland, former assistant district attorney Freda Black, Petersons defense attorney David Rudolf and Kathleens daughter Caitlin Atwater.