and it's pretty small. >> it is. it's really small. we immediately started measuring, and we knew right away that there was a big problem with their diagrams and the measurements. >> reporter: the problem? all those measurements were off. >> instead of 139 inches, somebody took the figure 139 and interpreted it to be 13.9 feet. 33 inches became 3.3 feet. and on and on and on. >> reporter: according to moffat, those flawed measurements, which were used in court, made the house appear much bigger than it was. >> they used the theme of distance to argue that mr. truman was lying about where he said his wife was when he heard what turned out to be this fatal shot. >> reporter: 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.