alex aguilar: that's our concern.- excessively 'cause it-- it was very well hidden. so we thought this is pedro trying to cover up. dennis murphy: pedro has-- gone from being a person of interest to a suspect in this disappearance-- erika friman: yes. it was very quickly, i felt, that that all happened. it-- it's hard to swallow something that huge when it's-- you know, this is somebody you've known for so long. dennis murphy: erika had to face the possibility that maybe she and christian hadn't been so good at keeping secrets. maybe pedro had known all about their relationship, and it had sent him over the edge. erika friman: i overheard police officers discussing that-- that i-- you know, like, a love-jealous rage kind of thing, like a love triangle i think they had said. dennis murphy: so how'd you bear up with that? erika friman: i didn't wanna think of that. i didn't-- i couldn't imagine somebody doing something so horr-- especially somebody as smart as pedro. dennis murphy: but when the crime scene techs process