witness against scott, he said, didn't see anything really related to a murder. but nonetheless forever tainted scott in the eyes of the public. and the jury. >> once you started looking at that case through an amber lens, everything he did was wrong. >> because he's a lying cheat. >> yes, he was. >> reporter: the affair with amber, said cole, made everything scott did look sinister, but didn't prove he killed laci. scott peterson was behaving pretty oddly? >> his behavior does look odd. he backed in -- himself into a horrible position. >> sure. >> he's thinking if anyone ever finds out about this woman, not only will it look bad for me, but that will become what this story is about, and he was exactly right. so he, very foolishly, and not very well, tried to keep her at bay with lies, thinking laci will be home next week. >> reporter: and that would