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her front door. she never made it. >> we can't explain what happened in those 20 steps. >> it just didn't make sense to me. >> a working mom murdered. >> it was hard to imagine that anybody would be capable of something like that. >> reporter: police started with the men in her life. was one of them behind her death? >> everybody was a suspect. >> the estranged husband. >> you know you are a person of interest. >> the ex. >> oh susie where are you? >> the brand new boyfriend. and the unbelievable thing, they were all there the morning of the murder. so who did it? >> my stomach was i...

5:19 a.m., the dome light came on. susie opened the door and got out just steps from her apartment. >> when she stepped out of brad's car, after he had stewed in that concave for 15 to 20 minutes as they were in the car doing whatever they were doing, i think he was extremely angry. when he saw her, i think he confronted her. i think she confronted him right back. >> i think when she told him she was going to continue a relationship with brad and that marty and her were done, think he was a no one's going to have susie sort of guy. >> it came to a head in that little alley there, and i think t...

>> meaning -- well, you know. >> it didn't add up that it was brad, and it didn't add up that it was ted. >> but marty perhaps? there were signs like those excess irv voice mails. >> please call me. >> and the bank video. his own admission that he hoped to reunite with suzie. the problem is he saw susie canoodling with brad, the mini van washed on his return home and yet marty larson was not arrested. >> i think that frustration was really, really hard for the family. >> what was your expectation? that they would look at this material they had and just go and arrest marty? >> i guess i just an...

Of actual proof that marty killed susie. >> i believe there was not enough evidence to bring this case and that's one of the reasons why it wasn't filed for all those years because other prosecutors had determined there wasn't sufficient evidence. >> much more evidence against ted casey, she said. >> ted casey, i believe, was the only one who had a real motive. they were fighting about the children, the monetary aspects of their marriage, and she had indicated to marty on several occasions that she was fearful of ted. and i i believed that his recounting of what he did that morning, had it bee...

Pull back in front of susan's. there's about a five-minute wait. i believe he's putting the body into the back of that van. then you see the van pull aside. >> that, said prosecutors, is when marty started driving back to billings. >> you have a body in your van. i think the river was the fastest and easiest way for him -- and to buy him some time. >> prosecutors produced this video showing marty at 8:15 a.m. 78 miles down the road stopping for gas, wearing a white t-shirt and black shoes that were never found. did he throw them away when he dumped her body? at 10:29 a.m., marty was back in bi...