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For being so small, you wouldn't think so. >> at just 20, heidy started working in the not entirely feminine gas and chemical industry just outside salt lake city. sandi sanchez was one of heidy's co-workers. >> we worked with hazardous chemicals and gasses. crazy things that you wouldn't expect a couple of girls to want to do. >> heidy seemed to thrive in a workplace that favored hard hats over heels. >> it was dangerous if you didn't follow the rules. in fact, quote from heidy, everything is dangerous, it's just what will kill you the quickest. >> to sandi, heidy became more than a co-worker...

>> mm-hmm. >> -- and she's shot, and you don't know what happened. >> yeah. maybe in their heads. in mine, i was confused. >> could this be an accident? >> what i say to that is i didn't see. i don't know what happened. >> that's how he felt just hours after the shooting, but as the months passed, conrad came to the conclusion heidy may have taken her own life. his wife, he said, wasn't as tough as she appeared. was she a sad person? was she a depressed person? >> when she drank a little bit, you could see it come out. it wasn't every time. but it did. >> heidy's friend sandi sanchez also saw ...

So you felt pretty good leading up to verdict? >> yes. there was enough "there" there beyond a reasonable doubt. >> reporter: conrad was having a much harder time. >> it was really difficult. you know? because why would things work out if they didn't work out the first time? you know what i mean? >> reporter: eight hours later, the verdict. hold up your hands. you're not wearing handcuffs. >> no cuffs. >> reporter: you're not in custody. >> i'm free. >> reporter: that's right. this time conrad truman got the verdict he wanted. not guilty. >> i just kept saying did they say not? >> he grabbed m...

>> conrad also shared with us how he picked the bathroom lock, not, he said, to confront heidy, but just to apologize. >> she just said get out. i was like, okay. so i just let her be. >> as for conrad's behavior after police arrived at his door, he said he had good reason for acting that way. >> i was trying to save my wife. i don't know. does that make sense? i just wanted her to live. >> i get how frantic you must have been. i'm not sure i understand the threatening part of that. and i think that's one of the things that ended up getting you in trouble. >> could be. and i was like, do i hav...

Extra." 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 suici...