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While conrad truman sat in a utah state prison marking time, his sister colette searched endlessly for ways to get him out. was there a time when you or anybody else in your family thought maybe we don't know him as well as we thought we did? >> no. >> reporter: he couldn't have killed her? >> not possible. >> reporter: so much about conrad truman's trial bothered his sister colette. but one detail in particular kept gnawing at her. it had to do with the diagrams used by the state depicting the area where heidy's body was found. >> i remember thinking, well, that's strange. that's -- that coul...

Immediately to the ground. >> reporter: wallace shared his findings with assistant district attorney craig johnson. johnson agreed. everything pointed to conrad. why would conrad truman want to kill his wife? >> under the circumstances, i'd say the motive was just based on this heat of passion argument that they were having. alcohol, a fight and guns, that's where we got murder. >> reporter: at the same time remember, the state's own medical examiner couldn't say whether heidy's death was a and johnson knew that would be a huge hurdle in court. >> based on my experience in courts with juries, ...

Blood! >> a young wife dying on the floor. >> she wasn't talking at all. >> i'm asking him like, conrad, what happened here? >> i was utterly confused. >> so many different stories about what might have happened. >> he said many things that night. >> maybe someone could have shot something at the house. >> at one point he said that it was 80% suicide. >> police had their own theory. >> i thought, oh, man, there's something going on here. >> we don't see a lot of women that commit suicide naked. >> conrad's stories were not adding up. >> but something else wasn't adding up either. a key piece o...

Zealously represent their client, but i can tell you categorically that that's not correct. >> reporter: just as stunned was the man whose team took the measurements, lead detective tom wallace. what went wrong? how'd that happen? >> in the process of transposing numbers from actual measurements at the scene to the crime scene program, numbers were just transposed wrong. >> reporter: wallace admits the error but says it was minor, that conrad truman did not deserve a new trial. >> it's not that significant as they made it out to be. >> reporter: did those incorrectly entered measurements chang...

Themselves if the state's diagrams were accurate. we later made that same trip with moffat, who showed us what they discovered. this is the area in question, 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, wh...