how did heidy truman wind up on her kitchen floor shot in the head? re, police were wondering about her husband. after all, conrad truman was in the house when heidy was shot, and there was no evidence of an intruder. >> i felt like they thought i did something. >> reporter: soon after he arrived at the scene, sergeant bill crook did begin to have his suspicions. >> reporter: he was what, moving around? >> yes. >> reporter: keeping paramedics from being at the body? >> yes, sir. >> reporter: there were other scenarios that needed to be explored, like accident and suicide. that's where detective tom wallace came in. >> there had been a number of theories. we obviously are going to exhaust them. that's going to happen. >> reporter: the medical examiner didn't make wallace's job any easier. his preliminary finding -- heidy's manner of death could not be determined. so wallace tackled each theory one by one. accident seemed hard to believe. thanks to conrad, heidy had firearms experience. can you think of any way it could have been an accident? >> no. heid

heidi and conrad truman had a special bond. a deep love. envied by others. but one, tragic evening, a gunshot rang out. and in the blink of an eye, heidi was on the floor, clinging to life. conrad's behavior in the minutes and hours that followed would be hotly debated, for years. detectives would focus on the grieving husband. but were they looking at the wrong man? here's josh markowitz. >> reporter: they seem to inc incongruous. the soaring majesty of the mountains and the story of a beautiful woman, struck down in her youth. it was a lot of things. tragic. crushing. stunning. but was it an accident? or a suicide? or a murder? police felt they knew, but as most cops will tell you, both the evidence and the jury have their own stories to tell. and the answer's not always so clear. certainly, that is true for this story. and, quite possibly, for the woman at its heart. her name? heidi wagner. >> as the baby, she was favored. everybody loved her. she could do no wrong. >> autumn was one of heidi's four sisters. >> she was just special. you know, she'd walk in