kim peterson: she would get the smile. that was one thing i think that she really loved to do was just make other people smile. andrea canning (voiceover): the two stayed in touch after graduation as they launched their careers. but that would all change suddenly on october 31, 2005. kim caught a story on the local news. teresa was missing. reporter: investigators say the 25-year-old photographer was on assignment for "auto trader" magazine when she disappeared. and my heart just kind of dropped knowing that it was somebody i knew. what do you do at that moment? i felt helpless because you want to just deny it. you want to try to get in touch with her. did you try to call her? i did try to text her, but-- andrea canning: no response? no response. andrea canning (voiceover): wisconsin police quickly launched a massive search, bolstered by a team of volunteers. after two days, a big break. they had found teresa's vehicle on the avery salvage yard. andrea canning (voiceover): tom fassbender, then a special agent with the wisc