shortly after they got together, david bought two matching cars, a black lexus for tracey, a white one for him. and because he owed back taxes to the irs, david decided to place his house in tracey's name, a decision he came to regret. >> david wanted to regain control of the house, and tracey wanted to make sure that she kept the house in her name. >> but there was one seemingly insurmountable hurdle to her being a suspect. >> in looking at her, investigators had to decide how she could have moved the body. after all, although she was a trim and strong young woman, she was almost half the weight of david, and moving him would have been no easy task. >> then tracey's neighbors told police they saw a large rental truck parked at their house during the weekend david went missing. >> are you aware of a moving van be being at your house? >> i mean, he -- a moving van? >> like a u-haul, ryder? >> yeah. we were getting a truck to move a -- some large stuff, the pool stuff, pool chairs that the dumpster wouldn't take. and they said that you'll have to move it. well, we don't have a vehicle, s