Transcript for Ingmar Guandique Says He Is Innocent of Chandra Levy's Murder: Part 6
Reporter: Just weeks ago during a visit to rock creek park where Chandra levy's remains were discovered, "20/20" producers got an unusual phone call. Reporter: The undocumented immigrant recently freed from a 60-year sentence for the murder of Chandra levy sits in an immigration detention facility awaiting deportation. And now has agreed to speak only with "20/20." Hello? Ingmar? Si. Reporter: Immigration and customs enforcement has a strict no camera policy in their facility, so we give Guandique a call. Have you ever harmed a woman? Have you ever shoved or hit a woman? Reporter: This could be your last chance to set the record straight. Did you attack Chandra levy? Reporter: Did you confess to morales? Reporter: He sounds a bit rehearsed, so we decide to fly down to the highly secured detention facility in farmville, Virginia, to look Guandique in the eye. We are about to sit down with Guandique, going to show him a picture of levy and ask him face to face if he killed her. Inside, he continues to maintain his innocence, saying he's found salvation for his previous crimes. Guandique seemed anxious to talk to us. He was filled with lots of details about why he's innocent, and of course, he denied that he ever touched or killed Chandra levy. 15 years after Chandra levy first went missing, here's where things stand today. The prime suspect, ingmar Guandique, wants to stay permanently in the U.S. It's unlikely that will happen. He's clearly got aggravated felonies, which is grounds for deportation. Disgraced congressman Gary Condit is out of politics and, for the most part, out of the public eye. But there he was last week plugging his new book on "Dr. Phil." I'm not the victim in this. The real victim is Chandra and her family. Reporter: The reporters sari Horwitz and Scott Higham wrote a book about the tangled investigation called "Finding Chandra." Both insist the misguided focus on Condit is the reason levy's killer is not behind bars. From the beginning to the end, terrible mistakes by police and prosecutors. And in the end, no justice. Reporter: The investigation is described to "20/20" as open but not active. The last hope could hang on that precious golden clue. Her ring is still missing. Guandique may have sold it or gave it to somebody. Hopefully they'll watch this program and let the police know. Whoever has that ring knows something about her disappearance and murder. Reporter: Finally, Chandra's parents, deprived of their daughter, deprived of justice, find some comfort in spiritual hopes. Are you preparing for the possibility that you may never know what happened to your daughter? One day I will be with my daughter, and whether we'll get the answer from god or not, I don't know. We'll find out then. And then maybe what Chandra would have said is, "What difference does it all make?" And despite our requests, Gary Condit declined to speak to "20/20." His attorney saying he was vindicated. After tonight, do you think Guandique had any role in the murder? Join us next Tuesday night for election coverage. I'm MARIA: Right now, part of 128
This transcript has been automatically generated and may not be 100% accurate.