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>> also no evidence. but police found a dark side behind that bright suburban facade. >> she slept with the children and the door locked. >> and finally a vital clue. what happened to nancy the day she disappeared? welcome to dateline. a young mother disappeared one her husband said she went for a run and never came home. the puzzling case happened in a safe, suburban neighborhood where crime is unexpected. but sometimes there are secrets hidden behind closed. >> it all seemed like such a bad -- >>. >> it. . at >> reporter: it was a saturday morning in july. the happy little world su...

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...

>> that is your worst nightmar imagining what is happening to your child >> a note with big demands left by mysterious kidnapper who seemed to know all, se all. >> they are watching the house and then the victim hersel calls. her mom jumping into work with police, would hand over th ransom herself >> if i didn't jump the mone properly, that would be the en of her she dropped the cash all right but who picked it up that's where everything went wrong? >> that's where everything wen wrong. >> kidnapping case about to go way off script >> her story did not mak sense. >> what was really g...

>> he was a family man, who didn't seem to have an enemy in the world. right up until, the night he was murdered. >> there was evidence of a violent struggle between jack and his killer. >> someone was keeping secrets and police thought they knew who. >> her -- was just scary. >> they thought they knew the motive to. but -- >> a matter of proving it was a different story. >> until someone found the perfect bag. >> hey, dude it's me. you need to call me asap. >> could they set the perfect trap? >> these people might literally get away with murder. ♪ ♪ ♪ >> hello, and welcome to ...

>> i'm craig melvin. >> and i'm natalie morales >> and this is dateline. ♪ ♪ ♪ >> he was definitely charismatic. >> he was the new kid in town, super popular, all about adventure. >> this kid was like, awesome. >> he jumped right in th culture. >> he liked to show off to the girls. >> they were the neighbors just down the block, of family in fear. >> they had their vehicles broken into, she was scared. >> someone had been sneaking into their home and now someon was in their garage. >> i'm sitting there panicking he's coming after me >> in a flash, it was over >> that charismati...