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Murder, and cold cases. >> we worked this case diligently for a long time. at some point, you hit the wall. >> reporter: there are nine detectives in placentia, working everything, drugs, gangs, rapes, murder, and cold cases. but 2008 it was clear placentia pd had hit that wall. they would need help on this one. and who they needed was a guy named larry. tell me about larry. >> larry is -- larry is phenomenal. >> reporter: phenomenal because, what, he sees things other cops don't see? >> phenomenal because he sees things cops don't see. i don't know anybody who could have done a better job tha...

Door. >> yes. >> reporter: she believed it because she wanted to. and because over the years, several people had told her they had seen lynsie. >> they never saw the front of her face. they always saw the back of her. and i held on to every word they said. >> we worked this case diligently for a long time. at some point, you hit the wall. >> reporter: there are nine detectives in placentia, working everything, drugs, gangs, rapes,

Lynsie ekelund. and neither was nancy, who remained convinced her daughter would one day just come home. you thought that one day, she would walk back through the door. >> yes. >> reporter: she believed it, because she wanted to and because over the years several people had told her they'd seen lynsie. >> they never saw the front of her face. they always saw the back of her. and i held onto every word they said. >> reporter: her friend kim remembers how hard it was on nancy thinking lynsie had just left her. >> reporter: it was torture for nancy, no matter what version of events you believed, ...