. >> reporter: july, 2015, lauren agee joins the fun with her longtime childhood friend hannah palmer. lauren posts, "can't wait for wakefest this weekend." lauren's not just joining the party, she's the life of the party. spirited, silly and striking. an avid dancer, she's even performed in music videos. with her devoted mom sherry, her biggest fan. >> we were inseparable. >> reporter: you called her mini me. >> mm-hmm. >> reporter: and she called you momma bear. >> momma bear. >> reporter: in her second year at a local college, she's studying criminal science. >> she wanted to solve mysteries. >> reporter: kind of ironic, because you're trying to solve the mystery of what happened to her. >> exactly. >> reporter: what happened to lauren begins that weekend at wakefest. friday, she and hannah slip right into party mode, all smiles on the lake. with them are hannah's boyfriend aaron lilly and his friend chris stout, whom lauren has just met. both young men clearly adrenaline junkies based on their social media accounts. on land, on the water, in the sky. at night they are at the only