mark moffatt: they used the theme of distance to argue that mr.heard what turned out to be this fatal shot. josh mankiewicz (voiceover): at trial, the prosecution argued, to believe conrad, you'd have to believe heidy shot herself in the bathroom and then walked 12 feet before falling to the floor. and according to the medical examiner, that was impossible. he testified heidy's head wound was so severe that she could have at most walked a step or two. this issue of distance was this big issue. josh mankiewicz (voiceover): but for ann taliaferro, just seeing the house and how small it was was proof enough that the prosecution's argument didn't hold up. when you walk in the house. there's no way that there's even 12 feet there. josh mankiewicz (voiceover): what's more, according to the defense team, conrad never told the police heidy shot herself in the bathroom. instead, he told them he had no idea where she was when he heard the shot. tell me your theory of what happened here. we believe that heidy truman shot herself in this very area. and we bel