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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. ...

>> they always look at the spouse. >> sure, everyone's a suspect, in the beginning you don't. no >> but in his case, david thought, it was a by the book formality. he was confident his friends would do all they could to find the killer. >> these were your brothers, these guys. >> right. >> you had written with them. >> you had done a lot of tough stuff with them. >> they'd been to my house, we had eaten together, we knew each other's families. >> i'm here at the indiana state police post. >> in this audiotape of his first interview that night, you can hear the interviewers handling him with ki...

>> reporter: the trooper who would become the lead investigator, was david's childhood friend. they had the talk right there. >> "dave, you know, we gotta clear you first." and i kept saying, "just do it right," i said that repeatedly. >> reporter: as a former cop, david camm knew the score about spouses. >> you knew because of your experience they always look at the spouse. >> sure. you know, everybody's a suspect. in the beginning, you don't know. >> reporter: but in his case, david thought, it was a by the book formality. he was confident his friends would do all they could to find the kill...

David thought, it was a by-the-book formality. he was confident his friends would do all they could to find the killer. >> these were your brothers in uniform these guys. >> right. >> reporter: you'd ridden with them. >> been to their homes. they've been to my house. we had eaten together. we knew each other's families. >> i'm here at the indiana state police post. also present is david camm. >> reporter: in this audio tape of his first interview that night, you can hear the troopers handling him with kid gloves out of respect. >> we're going to try and find out what happened here so we can --...

David thought, it was a by the book formality. he was confident his friends would do all they could to find the killer. >> these were your brothers in uniform, these guys. >> right. >> you'd ridden with them. >> i been to their --. >> you did a lot of stuff with them -- >> i had been to their house, and they had been to mine. we'd eaten together. we knew each other's families. >> reporter: i'm at the indiana state police post and also present is david camm. >> reporter: in this audio tape of his first interview, that night you can hear the troopers handling him with kid gloves out of respect. ...