have -- i may -- i don't understand. or i'm not going to answer that. and then it turned into more of just a cold stare -- and no emotion whatsoever. >> you describe it almost like a staring contest. >> yeah. we threw out there crime scene pictures of denise laying dead autopsy pictures to get a reaction. and she had no emotion. and i called her out on it. i said, "these people took you into your home, brought you back from lithuania, you lived with them. that doesn't bother you?" and she just looked at me, stone cold, and said, "i cried enough over the weekend." >> reporter: but then detectives asked her about something they learned as they traced nathan's movements the day of the murder. remember, one of the places he said he visited was this day spa, where he bought a valentine's day gift certificate for denise. but when detectives stopped there, they discovered that nathan had been bringing another woman to the spa, and it was none other than aina. it had happened so often, the owner said, she thought they were a couple.