. >> and we talk with tom fassbender a lead investigator in the case who is come under fire for thisal interrogation. >> you've stayed silent for this firestorm. why are you sitting here today? >> realized that someone needed to speak out, to bring forward the truth of what happened. >> so, what did happen here? our story begins with a woman at the heart of this case, a 25-year-old photographer from wisconsin named teresa halbach. >> she loved being behind the camera. >> kim and teresa became friends and college. both were photographers working at the same studio and green bay. kim says teresa had a special weight her subjects. >> she would get a smile. that's one thing i think she loved to do, make other people smile. >> the two-state in touch after graduation as they launched their careers. that would all change suddenly on october 31st, 2005. kim caught a story on the local news, teresa was missing. >> investigators say 25 -year-old photographer was on assignment for auto trader magazine, when she disappeared. >> my heart kind of dropped knowing it was somebody i knew. >> what do