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invites a friend to sleep over. the next morning, shes dead. >> oh, my god! i dont feel a pulse. >> what in the world happened? how could this be? >> turned out this was no ordinary slumber party. >> we know from their phones that this was a planned event. they had discussed it. they took pictures. >> stories surfacing of a dangerous experiment. >> the main purpose of having the sleepover was to try it. >> an experiment that just might tempt other teens. >> we know its entered our high...

>> a bright and beautiful teen invites a friend to sleep over. the next morning, shes dead. >> oh, my god! i dont feel a pulse. >> what in the world happened? how could this be? >> turned out this was no ordinary slumber party. >> we know from their phones that this was a planned event. they had discussed it. they took pictures. >> stories surfacing of a dangerous experiment. >> the main purpose of having the sleepover was to try it. >> an experiment that just might tempt other teens. ...

dangerous experiment. >> the main purpose of having the sleepover was to try it. >> an experiment that just might tempt other teens. >> we know its entered our high school. >> why the clues in this mystery could save a life in your family. >> you have a lot of people watching "dateline" that need to talk to their kids. >> welcome to dateline. parents always worry there are so many dangers out in the world a teenager can face. but at a slumber party in your own basement? how could somet...

Goofy sometimes and they enjoyed that. >> reporter: she lived with her parents, tom and mai, and her little sister, in the quiet, suburban city of woodbury, minnesota, not far from the twin cities. >> tara was a really energetic kid from a very young age. >> reporter: according to her dad, she was a bit of a dare devil. >> she liked to do skateboarding and climbing walls. she liked to do tubing -- >> on the back of the boat? yeah, on the back of the boat, because we had a cabin and she would jus...

Twin cities. >> tara was a really energetic kid from a very young age. >> reporter: according to her dad, she was a bit of a dare devil. >> she liked to do skateboarding and climbing walls. she liked to do tubing -- >> on the back of the boat? yeah, on the back of the boat, because we had a cabin and she would just be a dare devil on that. >> she liked going and taking risks and stuff. >> reporter: but her family and friends agree, taras greatest passions were drawing and music. >> she had a pre...