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>> i did not shoot my mom and i would never shoot my mom. >> two trials. >> every emotion hit. >> two verdicts. >> there were only two people who knew what happened that day. one of them's dead and the other one is sitting in that chair. >> too much to bear. >> it's just been a hell on earth. ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ >> hello and welcome to "dateline." bill and shirley carter built a comfortable life and raised a family on their sprawling farm in america's heartland. as their golden years approached the couple fell into a routine. daily coffee, working the fields and spend...

Corn and soy beans. then plowed the profits into more prime iowa acreage. shirley loved farming. >> she did everything. >> she just took to it, huh? >> she was a natural. >> she loved being in the tractors. >> long time friend and neighbor, irene schultz, says shirley brought a little pizzazz to the fields when she climbed into her custom made tractor. >> she always put a little bit of make-up on every morning before she went on. >> up on the john deere she's decked out? >> she had rosy cheeks. she was beautiful inside and out. >> in time, daughter jana married and moved away to a job in des m...

>> 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...