heidy and truman had a bond envied which others. but in one tragic even, a gunshot rang out, and in the blink of an eye, heidy was on the floor clinging to life. conrad's behavior in the minutes and hours that followed would be highly debated for years. detectives would focus on the grieving husband, but were they looking at the wrong man? here's josh mankiewicz. >> they seem so incongruous, the soaring majesty of utah's wasatch 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? heidy wagner. >> as the baby, she was favored. everybody loved her. she could do no wrong. >> autumn was one of heidy's four sisters. >> she was just special. you know, she'd walk into th

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