wife back. >> he sounded heartbroken but not everybody was buying the distraught husband story. >> people were saying, oh, the husband must have had something to do with it, must have hired somebody. we all watch a lot of "dateline." >> carl jr., so worried about his mom, now feared his dad could become a suspect. >> they were asking questions like, okay, you're the husband and you just went into this home to search for her, you've gone up in the attic. your fingerprints are everywhere. you just completely contaminated our crime scene, why did you do that? and so you could just see their wheels turning. it was like, oh, no. >> he was right to worry. detective allison brought carl sr. in for questioning. >> did you put carl in an interview room? >> yes. >> and treated him like this is someone we need to take seriously? >> yes. >> any time you do an interview like that, it's best to do it in that setting. you're down at a detective's