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Don't think of them. The pain becomes a part of you. Get everybody out here to my house now. He came home and found her, his entire family gone. I said what are you talking about, what are you saying? it was surreal. As fellow cops suspected him. I did not do this. I did not do this. She was upset. She felt like history is repeating itself. Or police just plain wrong? it's like a twilight zone. Lies become truth and the truth becomes lies. May be the real killer was still out there. You have lied to the police about this case. So devastating. We know that was probably the key to solving this. ...

I'm having to buy burial plots. you know, i've got all this stuff going on. >> reporter: three days after the murders, the indiana state police called david in for a second interview. he sat down with two cops he knew well. he'd been sharing coffee and cases with them for years. >> because of the high profile of this case and because of obviously you know we're doing this. >> this time the tone of the interview had changed. because now, the investigators did have a working theory of the murders. and the evidence they were gathering pointed to none other than david camm as the killer. their one...