lieutenant biggart was holding the door open, and we walked in, and he was like, "mr. they didn't explain anything to you? >> he didn't say anything. he just said, "it's going to be a long night." i walked out the door of the sheriff's department, and i kind of stood there for a minute. and i'm like, "what in the world just happened?" >> we took her up to the sheriff's department interview room. >> we got a couple questions for you. >> myself and detective lieutenant biggart conducted the interview. >> you have the right to talk to a lawyer and have them present with you while you're being questioned. >> she was read her rights. she was willing to talk to us right away without hesitation. >> this video, obtained exclusively by "20/20" -- >> if you give up the right to remain silent and later wish to stop answering questions, no further questions will be asked. you understand that? >> i understand. >> okay. >> that's the first time i heard those. >> oh, i didn't do it before? >> no. >> we try to do all that. >> we basically right off the bat asked her who jeremy cuellar