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>> i always loved david. >> -- or just maybe a black widow? >> barbara britton is in the middle. >> "buried clues." hello and welcome to "dateline extra." i'm craig melvin. the case sat cold for more than a decade, and then rookie detective donna velasquez got the file and turned up the heat. she'd been given the basics. 24-year-old divorced dad david jackson had vanished without a trace. digging into david's past, she uncovered a twisted tale of love gone bad and a chilling family secret. but to learn the full truth behind david's disappearance, the detective would have to sort the players fr...

First kay now becky? >> it just -- it did not make sense to me. >> what in the world was going on? >> that's what i wanted to know. >> reporter: sheriff's deputies immediately canvassed the neighborhood looking for anyone matching becky's description of the shooter. >> so you have a gunman on the ground on the loose. >> right. >> what are you doing on that score? >> we had started sending units out to see if anybody had seen anything, see if anybody heard any gunshots. see if they saw anybody matching the description of the suspect. and we were not able to find anything. >> reporter: the only ...

Grass beds breaks the currents. it works just like real sea grass it behaves in a way that's very similar to real sea grass field full of. the experiments that we performed we learned that the speed of the current changes both within our beds and on the upstream side of it. but as the mounts. they construct being made of natural fibers or plastic and the researchers are still looking for the optimal material sciences. ousting that and the one it has to be as close as possible to the real thing but also easy to produce. and most importantly it has to disappear without a trace as natural sea gra...

Was she really a bereaved ex -- >> i always loved david. >> -- or just maybe a black widow? >> barbara britton is in the middle. >> "buried clues." hello and welcome to "dateline extra." i'm craig melvin. the case sat cold for more than a decade, and then rookie detective donna velasquez got the file and turned up the heat. she'd been given the basics. 24-year-old divorced dad david jackson had vanished without a trace. digging into david's past, she uncovered a twisted tale of love gone bad and a chilling family secret. but to learn the full truth behind david's disappearance, the detective w...

Not drive, i would walk back and get her and sleep it off or leave in a few hours and i would take her. >> she left the party and just like that, christina morris vanished. >> after she vanished without a trace, it was a race against the clock to find christina morris. >> coming up. >> i got a feeling in my stomach. >> the first clue to the mystery. >> they found christina's car. she never got in it. >> when "dateline" continues. atn s can you feel it ♪ ♪ can you feel it ♪ can you feel it ♪ can you feel it box: woah! ♪ can you feel it woman: delivery ♪ can you feel it woman: alexa,...