Transcript for New Recordings in Chandra Levy Murder Case
We move on to more details on the Chandra levy case, one of Washington's most notorious murders and cost a congressman his job and there's new reporting on the case, Amy? The mystery surrounding her death and disappearance and connection to Gary Condit including voice mails you've never heard before. It's around 6:30. I haven't heard from you. Reporter: That's the voice of Gary Condit heard for the first time to Chandra levy, the 24-year-old intern whose disappearance captured the nation's attention and forced the married congressman out of office under a cloud of suspicion. It's 11:45. I'm sorry. I've been tide up for the last few days but you already know that. Reporter: Interest in this case now reawakened in light of a new book by Condit and last week's interview on Dr. Phil. You developed a friendship with her and you saw her outside the office, correct? I saw her one time. Came by your con bow once. Maybe twice. You say in your book that she had come by a handful of times. Yeah, I mean I said handful of times. Could have been four times, could have been five. Reporter: The first time he's spoken about the case since ABC's interview in 2001. Did you have anything to do with her disappearance? No, I didn't. Reporter: But now these never before heard messages from a night in early may 2001 when Chandra was already missing. Maybe you're out of the country or something. Anyway, give she a call if you get this message, bye. Reporter: The former congressman always insisted he had nothing to do with her death and still won't comment on the nature of their relation ship. Why is it you will not answer publicly whether or not you had a sexual relationship with Chandra levy? Dr. Phil, I haven't, you know, answered that question publicly for 15 years and I'm not going to change my position or my view on that today or probably any time in the future. Reporter: But now new questions emerging like why was the married congressman calling a young intern to arrange a get-together. Give me a rundown on kind of what your schedule is, things are looking pretty good for me today anyway, bye. Reporter: On tonight's "20/20" you will see the story of how the case against the man once convicted of killing Chandra levy was blown apart when an extra from "The house of cards" secretly recorded a key witness. You will hear audio from her seven-hour recording for the very first time. So many questions still in this case. The whole story and you will learn more on "20/20." Mystery in rock creek park at 10:00 eastern on ABC. Thank you, Amy.
This transcript has been automatically generated and may not be 100% accurate.