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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...

The significant others of two victims say, they now know their loved ones saved lives before they were killed

>> reporter: excavation resumed for two more days. finally on the third day searchers uncovered a waterproof tarp. inside were the remains of mike snyder. >> ellen had been saying mike was in phoenix, mike this, mike that, and all along, mike wasn't in phoenix. >> reporter: for mike's family, the finality was devastating. >> to not know for eight years and somewhat hold on to hope and to have that hope finally just pulled out from under you was very difficult for all of us. >> reporter: ellen snyder sat in defense attorney penni adrian's office, knowing an arrest was eminent. >> they had found...

>> ellen was saying mike was in phoenix, mike this, mike that, all along mike wasn't in phoenix. >> for mike's family, the finality was devastating. >> to not know for eight years and to somewhat hold onto hope and to have that hope finally just pulled out from under you was very difficult for all of us. >> ellen snyder sat in defense attorney penny adrian's office knowing an arrest was imminent. >> they had found the body, and she wanted to get it over with. she said, we just can't go on like this. >> so adrian informed the police that ellen snyder was ready to turn herself in. >> that follow...