and the one thing they had in common was ralph candelario.lone wasn't enough, wasn't proof. so the investigation continued. >> yes. >> reporter: in an effort to shake him or maybe even get a confession, they sought help from the one person whose presence back at the hospital made ralph break down and cry, shannon. >> cbi had me call him. bugged my phone and tried to get him to tell me what happened. >> reporter: she must have been so nervous, by the way. >> she was terrified. it was probably one of the hardest things she's ever had to do. can >> ralph? hey, this is shannon. >> reporter: but shannon did it. >> i've been waking up having panic attacks. i can't deal with this. i want to know what happened. can you tell me anything? >> yeah, the only thing you know that i know is that a lot of stuff was stolen from the house. >> okay. >> reporter: ralph stuck to his story. a deadly home invasion. >> and then i found her. >> yeah. >> and that's you know -- >> yes. >> and i try to deal with that. >> reporter: shannon pressed ralph for details. >> t