Scott Peterson’s affair revealed to public, sparking a media frenzy: Part 6

Amber Frey revealed her relationship with Peterson during a police press conference. Police believed that the affair could have been Peterson’s motive for his wife’s disappearance.
8:08 | 05/15/21

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Transcript for Scott Peterson’s affair revealed to public, sparking a media frenzy: Part 6
Can someone help me? My name is Janey Peterson. My brother in law, Scott, has been on death row in California since 2005. So, ever since that time we've just consistently taken every step that we can take to prove he's innocent. Our family was very surprised and disappointed to find out that Scott had been unfaithful to Laci. All of a sudden, amber Frey lays out her story to the world. Amber Frey is prepared to give a statement, and she will not accept any questions. Ms. Amber Frey. The story gets elevated from a media perspective when amber Frey comes out. I literally was having a panic attack, and I was like, I can't breathe, I can't breathe. When I discovered he was involved in the disappearance, the Laci Peterson disappearance case, I immediately contacted the Modesto police department. It was just so scary, because I'm putting myself out there. I am a single mother with a 23-month-old child, and I ask to respect my privacy. Thank you. The press conference was short. She didn't answer any questions, but she was a sympathetic and credible person. That changed everything, not only changed it for Laci's family, but also it just ignited the media firestorm. Took it to a whole other level. She's asked to have her privacy respected. We're going to do that. We're not gonna comment about amber, her private life. Amber wants to be able to go on with her life. It was so hard, the media was labeling me as the mistress, and I was pretty much out there on my own for months. Readers like a story to solicit an emotion from them. Love, hate, anger, sadness. And unfortunately, this was one case that provided all of that. The rochas turned on Scott. They closed the volunteer center down, and they said that Scott was not truthful and they were urging him to come out and tell the truth about everything. I would like Scott to know that I trusted him and stood by him in the initial phases of my sister's disappearance. However, Scott has not been forthcoming with information regarding my sister's disappearance, and I'm only left to question what else he may be hiding. Did it make you think that indeed he may in fact have something to do with what happened to Laci? I think it raises questions for all of us. Scott needs to come forward and answer the questions that are put to him. Once amber Frey came out, suddenly Scott Peterson had a lot of explaining to do. How you doing personally? How you holding up through all that? Oh, it's a tremendous strain obviously, so -- Answer the questions, Scott, I'm going to rattle you Scott. Scott, do you have anything to say? It was a tsunami, a frenzy. He was the most hated man in America at that time. He started receiving a lot of animosity from the public in general, from media. He was on the tabloids every week. You have to understand he was virtually run out of town. Hey, Scott? Scott, any comment? Scott, you got a second? Scott? Hey Scott? He had media following him. Are you taking a polygraph test? Hounding him every day. He had shock jocks lined up in front of his house with bull horns screaming murder. How come nobody saw you at the Berkeley marina and nobody saw Laci walking the dog, huh? He was tired of the tabloids and the networks and everybody hounding him wherever he went. Sorry, this has been bad journalism. We apologize, Scott, for asking pointed questions about all the untruths you've told. So when you heard that he was seeing another woman, what did you think? What do you think now? Well it was -- it was surprising. It was disappointing, but that's the reality of life. Men have affairs. Women have affairs. When their wives are eight and a half months pregnant? Probably more so. That's mostly when men do, we've learned. I had no idea. What was it like to realize that your infidelity may have played a role in the search? I'll die with that knowledge that what I did compromised the search for her. It's my fault, so that just adds so much to what I feel. He has to die knowing that everyone stopped looking for Laci becausee was having an affair. The entire country thought that he was guilty and responsible for Laci's disappearance. So the Peterson family urged him to get out there, do some interviews, and get people looking for Laci again. I am going to speak to the press. I'm debating on when it should be done, because Tuesday is the state of the union address, and I want maximum coverage. This morning, an exclusive interview with Scott Peterson, breaking his silence in the case of his missing pregnant wife. I think everybody sitting at home wants the answer to the same question, did you murder your wife? No. No. I did not. And I had absolutely nothing to do with her disappearance. You use the word murder. And right now, everyone's looking for a body. And that is the hardest thing, because that is not a possible resolution for us. And I know that suspicion has turned to me because of the inappropriate romantic -- that I had with amber Frey. Did your wife find out about it? I told my wife. When? In early December. A lot of arguing? No, it didn't break us apart. There wasn't a lot of anger? No. Do you really expect people to believe that an eight-and-a-half month pregnant woman learns her husband has had an affair, and is saintly and casual about it? Accommodating? Makes a peace with it? Well, I -- yeah, you don't know -- no one knows our relationship but us. There's no way that Laci knew about it and would not have told us. Not all of us, but one of us, and said, oh, my god, I need to leave Scott. Much less be okay. And be okay with it. I don't buy it. I don't buy that one at all. We make no excuse for Scott's behavior in that sense. We make no excuse for the things that he said to amber. But unfortunately, a lot of that is being used to convict him of murder. And really what all of that is, is evidence of adultery. There was one report that a neighbor had seen you loading something into a vehicle. I'll have to stop if you ask me more detailed questions about their investigation. I knew he had killed her. I knew she was dead. I'll never know what happened. I know that, but I needed to have her back. That was so important to me. I just needed to have her back and that was one of the things that was just so absolutely frustrating, because you know

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

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