is just a few months before the murder when jack was diagnosed with colon cancer. the shock of course. but one of two shocks for sandra. and, to those around her, the second seemed somehow worse. her beloved son, tom up and moved. to arizona. >> and she was flipping out about it. >> yeah. >> she had to go. there >> she demanded jack moved to arizona to. >> that woman was off her rocker. her tone was just scary. it was like somebody else's voice coming out of her. >> but, surely that wasn't motive enough for murder. and, with plenty of suspicion, little else to go. on why it spent months pouring over sandra and jack's record statements, credit card bills, searching for, well he didn't know exactly what he was searching for. but, he was getting basically nowhere. >> we couldn't establish a pattern that was suspicious. >> then, why it's investigation