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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...

On this one. thank you. >> totally different tenor when he still hadn't talked to her. >> i would have thought he would have been more angry as time went by when she still hasn't returned your calls, they still don't know where you are, and now he's going into alibi mode. >> the final piece of the puzzle for prosecutors? remember how marty vigorously cleaned his mini van inside and out? not quite enough. one hair was found. it was in the back of the van where he had put a body. >> of course, we did the dna and it was hers. >> so, a strong circumstantial case, except the marty who showed up in ...