reporter: jason would carry on the farming tradition for another generation. and best of all he and his wife, shelly, lived close by. bill and shirley soon had grandchildren to dote on. a happy family picture suddenly disfigured by the ugly murder of shirley carter. dci agent mark ludwick took the lead in the investigation. first, we want to identify all witnesses and we want to separate tehem and we want to conduct a face-to-face sit-down interview as soon as we can. reporter: early on, the most important witnesses were bill, the husband, and jason, the son. ludwick assigned deputies to take the two down to the pleasantville pd. and uh, she said do you want to go get coffee? reporter: in an interview room, bill told investigators the same story he told us. how he dropped shirley off at home and then ran a load of corn to the grainery and then he raced home to find his wife still on the floor. and when i went in and i felt her, she was cold.