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>> my friend called me and she was hysterical. she said sandra has been killed. i was like, oh, my god. as soon as she was killed, we all knew who did it. as the months went on, we just realized that this guy is going to get off. how is this happening? just keep praying. that's all we can do. >> there aren't a lot of murders in paradise. people still talk about this one. >> just a darling girl with two darling children. >> it is a story keith morrison followed for nearly ten years. >> how? when? >> i got a call from her boss, said she hadn't showed up for work. >> they found her in t...

murders in paradise. people still talk about this one. >> just a darling girl with two darling children. >> it is a story keith morrison followed for nearly ten years. >> how? when? >> i got a call from her boss, said she hadn't showed up for work. >> they found her in the car. >> i saw in the back of her neck some ligature marks. >> just didn't deserve that. >> a small island, a small pool of suspects. ryan, her lover with a past -- >> i had no idea he was a drug dealer. >> and darren, the soon-to-be ex-husband. >> that morning he called in sick. >> was darren polygraphed? >> he did...

Break me. ♪♪ i'm craig melvin. >> and i'm natalie morales. >> and this is "dateline." my friend called me and she was hysterical. and she said, sandra's been killed. i was like, oh, my god. as soon as she was killed, we all knew who did it. as the months went on, we just realized that this guy's going to get off. how is this happening? just keep praying, that's all we can do. >> there aren't a lot of murders in paradise. people still talk about this one. >> just a darling girl with two darling children. it's a story keith morrison has

Report about his demeanor that night? >> you know, initially investigators thought that maybe he wasn't saying everything that happened and -- >> yeah. and he's -- >> you know. >> holding back a little. >> yeah. and maybe he was a little bit nervous. >> but ryan had an alibi, right? he was at work when sandra was killed. well, ponce found out the estimated time of sandra's death was really more of a rough guess. and that sandra could just as well have been murdered hours earlier, when ryan wasn't at work. and then there were the results from ryan's 2006 polygraph exam. what was the result of t...

And it turned out to be two different married women. >> sandra confronted darren. >> he would never admit it. he just kept saying they were friends, they were friends. >> and she knew otherwise. >> she knew what it was. >> by june darren had moved out. and sandra moved on. got a job at the beach house restaurant, an island landmark. it was a life-changer. >> she was just a darling girl, you know? with two darling children. >> christa hall was a waitress at the beach house and saw, firsthand, sandra's transformation from quiet island girl to young working woman. >> and she wore her hair back in...