>> scientists performed dna testing on each and every bloodstain on dr. hamilton's shirt and shoes. it was all susan's blood. luminol tests revealed even more of susan's blood on the inside of dr. hamilton's car. >> there was blood found on the steering wheel. there was blood found on the driver's side left edge of the seat, and also some hair and tissue found on the floor of the vehicle, on the driver's side. >> investigators discovered what may have been the murder weapon. the hamiltons' maid said that a marble figurine from the bathroom was missing. and communication records indicated dr. hamilton was not in the hospital in between his two operations on the morning of the murder.