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 spending time with the grandkids. one morning, gunshots rang out, leaving shirley dead, planting the seeds of a mystery that would turn one family member against another. here is dennis murphy with the farm. reporter: council bluffs, iowa.te in a small courtroom, the new, and final, scene of a four-year long drama was playing out. count one, murder in the first degree. the defendant did, having malice aforethought, willfully, deliberately, and with ug premeditation kill shirley dean carter. reporter: it s a case that ripped the stitches out of a te