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>> 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. >> 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. ...

Followed her usual busy routine working, then shepherding the kids' around after school, returning home about 7:30 pm. was the shooter waiting for her in the garage? or did her killer follow her in? the investigators asked david if anyone had been stalking kim, bothering her. >> if there was, she hadn't said a word. >> how 'bout phone calls? get hang-up phone calls, suspicious phone calls? >> not really. >> reporter: and they wanted to know if the husband could help them understand an oddity about the crime scene. why would kim's shoes have ended up neatly placed atop the roof of the bronco? >...

>> 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 killer. these were your brothers in uniform, these guys. >> right. >> you'd ridden with them. >> i been to their --. >> you had done a lotta >> homes. they'd --. >> tough stuff with them. >> -- they'd been to my house. 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...

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 killer. >> these were your brothers in uniform, these guys. >> right. >> you'd ridden with them. >> i been to their --. >> you had done a lotta >> homes. they'd --. >> tough stuff with them. >> -- they'd been to my house. 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: i...