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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...

>> yeah. i just felt like i needed to hear that at that time, and i didn't get to hear that, and that it was still possible he could have had involvement. >> ted, who still lived under a cloud of suspicion, believed that marty killed susie. >> there was a lot of nights i didn't sleep real good wondering if somebody was going to show up in the middle of the night with a gun. >> but it was rusty during his many sleepless nights who devised a plan to do what police and prosecutors seemed unable or unwilling to do. >> he was going to get justice for our family, even if he had to do it himself. >> ...