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marriage to work, i did not give up. >> soon he was gone, vanished without a word or a trace. >> he left the young daughter behind. he left the house. >> was this a husband who did not want to be found? or could this be something else. >> detectives are not an undercover operation. that would lead to a long -- >> hard to say ready for that? i know that it has to happen. >> disappearance in the desert. could it be the perfect crime. i can only imagine what would be like to keep that. welcome to dateline. i'm lester holt. for eight years it was a mystery, a husband who had simply vanis...

executive. but as your career was on the rise. her marriage was on the rocks. sydney >> i still wanted this marriage to work, i did not give up. >> soon he was gone, vanished without a word or a trace. >> he left the young daughter behind. he left the house. >> was this a husband who did not want to be found? or could this be something else. >> detectives are not an undercover operation. that would lead to a long -- >> hard to say ready for that? i know that it has to happen. >> disappearance in the desert. could it be the perfect crime. i can't imagine what would be like to keep tha...

Until they had a body. >> and so another four years passed. mike's sister teri became more and more dissatisfied with the progress detective wilson was making. >> i think at first he was very zealous. he felt that, you are right, a lot of this isn't adding up and i believe at first they worked very hard to find my brother. >> as the years went by, the unknown had become unbearable for the snyder family. they wanted answers from the police. >> i think he got very upset with me that i was being pushy. our phone conversations got less and less. i would call and leave a message and my messages wer...

Go along with her story. because it was closer to the time she was going to kill him. >> even if it was an act of self defense that caused ellen snyder to shoot her husband, why hasn't she called police? >> usually when abused women kill their abusers, they call the police and they are sitting there with the gun when the police drive up. >> okay. >> they don't try to evade responsibility. they admit what they did and they say, i didn't have any choice. pretty much as you are saying to me now. but they don't bury the body. and tell a series of pretty good lies over a long period of time. that's...

>> we are going to ask you questions, all right, that we already know the answers to. you knew this day was coming ever since you were 17 years old. how you answer the questions and your honesty here is really going to change your life from this moment on. okay. all right. detective wilson here has been investigating the disappearance of your stepfather. >> why don't you tell me right now what you know what happened to your stepdad, michael snyder. michael snyder who helped to raise you. >> at first, michael tells the same story that ellen has told since the day michael disappeared. >> remembe...