Investigators dig into Scott Peterson’s alibi, the family begins to search: Part 3

Modesto Police detective Allen Brocchini says Peterson was calm during questioning and that he reported no problems in the marriage. Family members became suspicious when Peterson evaded the media.
6:12 | 05/15/21

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Transcript for Investigators dig into Scott Peterson’s alibi, the family begins to search: Part 3
Go play golf at the club or go fishing. Okay. Seemed to go cold to go play golf at the club so I decided you know, 9:30. I've done a lot of missing person cases and I don't recall ever asking the husband or the wife to come down to the station and sit through a video interview. So, today she told you what she was going do for the day. Yeah. And what was that? Take the dog for a walk, and then she was going to the store to buy for Christmas morning breakfast tomorrow. She was going to make gingerbread cookies for tonight. He was calm. His demeanor wasn't urgent. He didn't have that sense of urgency that you would expect, that you saw from other people. Have you guys -- you guys haven't had any problems, marriage problems? Everything's good? Mm-hmm. And you have been married four years? Yeah. He just doesn't seem like the guy whose wife is missing. In the initial hours where normally you would think the husband would be like, stop talking to me. Get out there and find my wife. I didn't do it. Leave me alone. But he just didn't -- something about him in the way he was answering questions, his demeanor, was suspicious. Okay, did you drive straight there? You get your boat in, how long you think you stayed in the water? Felt like an hour and a half or so. Did you have a map for that area? No. What, you just wing it? Uh-huh. I remember asking him about the boat. I asked him, when did you buy the boat? His answer to that question was, it was a surprise for Ron. He didn't tell me when he bought it. He told me it was a surprise for which made no sense at all, of course. Those are the kind of answers I would get to questions I asked. Never a straight answer. We began our immediate search of the park and river areas. Waterways, vacant lots, vacant buildings, abandoned cars, abandoned barns. I want to make sure that everything has been checked. Tip line telephone number is 342 -- The Modesto police had issued a press release that Laci was missing, and in that press release, they publicized what Scott's alibi was. They said that he was fishing in the San Francisco bay area. I was absolutely stunned that they had released Scott's alibi. And I remember thinking, you know, we don't know who has her. We don't know what their intent is. And if their intent is to harm her, they're going to go put her body in the bay." Whoever has her, please, please, please, let her go. Bring her back to us. We love her so much. We want her back. Please, give -- let us have her back. The room is packed, and we got the chief up there talking about her and the fact that Scott went fishing. And man, the hands start coming up -- he went fishing? Where'd he go fishing at? And he got up and walked out, Scott did. And so we obtained a search warrant for his house. We went in and he was reading the newspaper at the dining room table. So, we give him this form and it says, I give consent for us to search all that stuff. And all he has to do is sign it, and we can search. And he picks it up and he reads it, and he's like, you don't expect me to sign this without a lawyer do you? Well, we weren't sure, but we have a search warrant. He's like -- he looks right at me and he's like, Al, where's the trust? I mean, that's what he says to me. "Where's the trust?" Scott Peterson wanted to give off the impression that he was being completely forthcoming and helpful to the police. But there were lines that he drew. Scott was always in the background. He was adamant that his photo not be put on posters. That pictures of him not be taken. He didn't want his -- their picture up at all. Everything of her and him had to come down off the wall. It only could be pictures of her, and he -- but the way he took it down, he goes, oh, I'm going to keep this. We had this wall in there. When you first walk in, there was this wall and we had pictures of her everywhere. And he would make sure every picture of him was down off the wall. Daily. Daily. We would put more up, they would come down. Let me go to you. Jackie Peterson, where is Scott tonight? I would imagine he would be out begging the viewers to help in the search for his wife. He is, and he has, and he is with friends this evening that have been searching all day. There is a lot of questions on why I have not been in the media. Media will put, I believe, emotional stuff out there for a couple of days, and then the story will get dropped for something else. It was our thoughts that if I was to hold back from the media, the media would continue to come because frankly, the camera, reporters they want something they can't get right away. This was our way of keeping the media coming back for us. He's as smooth as they get. He's cool. He doesn't seem to get rattled. He seems authentic. So many people say, Christmas eve, you have a very pregnant wife, and you decide to go fishing? My day was open to play golf or go fishing. I chose fishing that day, which was, you know, the choice I made. I obviously regret now, you know, like, just decide to stay home this would not have happened. He was nervous, he was under the spotlight, he was being questioned, and he hid a terrible secret.

This transcript has been automatically generated and may not be 100% accurate.

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