reporter: according to sandi, those things had to do with heidy s upbringing. most significantly, heidy grew up not knowing the identity of her father. that really bothered her. you know, she did not know her dad. and she had always wanted that. it bugged her tremendously. reporter: enough to take her own life? had she ever attempted suicide before? never to my knowledge, no. reporter: she never talked about it. no. reporter: it s very hard to believe that what was going on in heidy s life at the time, what seemed like a pretty happy marriage to you, she s going to spur of the moment decide to commit suicide like that? well, that s a tough question. it s like how do you really know when someone s going to do that, you know? reporter: as he lived his life behind bars, conrad continued to speculate. he also tried to stay hopeful. i was just like, this is going to work out. it has to because i didn t i didn t do this. reporter: conrad s family never gave up on hi
heidy was no pushover. she was kind of intimidating, actually. for being so small, you wouldn t think so. reporter: 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. reporter: 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. reporter: to sandi, heidy became more than a co-worker. i considered her my best friend. she s a person that you knew into never stab you in the back. she s a person that you knew would always have your back. reporter: in person she could be both, sweet and salty, and that caught the attention of one of her colleagues, 25-year-old conrad truman. i noticed
believe that you could be right there with her in a very small area mm-hmm. reporter: and she s shot, and you don t know what happened. yeah. maybe in their heads. in mine, i was confused. reporter: could this be an accident? what i say to that is i didn t see. i don t know what happened. reporter: 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. reporter: heidy s friend sandi sanchez also saw another side to heidy. that strong, funny, you know, person also had some things inside that were very painful.
area mm-hmm. reporter: and she s shot, and you don t know what happened. yeah. maybe in their heads. in mine, i was confused. reporter: could this be an accident? what i say to that is i didn t see. i don t know what happened. reporter: 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. reporter: heidy s friend sandi sanchez also saw another side to heidy. that strong, funny, you know, person also had some things inside that were very painful. reporter: according to sandi, those things had to do with heidy s upbringing.
actually. for being so small, you wouldn t think so. reporter: 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 gases. crazy things that you wouldn t expect a couple of girls to want to do. reporter: 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. reporter: to sandi, heidy became more than a co-worker. i considered her my best friend. she s a person that you knew to never stab you in the back. she s a person that you knew would always have your back. reporter: in person she could be both, sweet and salty, and that caught the attention of one of her colleagues, 25-year-old conrad truman. i noticed her first in the hallway. reporter: what did you think?