Lance Armstrong Confesses to 'Living a Lie' in New Documentary

Former cycling champ opens up about doping, lying, and losing his cancer foundation Livestrong.
2:02 | 09/06/13

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Transcript for Lance Armstrong Confesses to 'Living a Lie' in New Documentary
We turn to our abc news exclusive on lance armstrong. We hear him open up and tell all about his drug use and his lies, in real-time. Documentary filmmakers given unrestricted behind-the-scenes access as the scandal's unfolding. Neal karlinsky has the story. Reporter: It's the first glimpse at lance armstrong since he confessed to a career fueled by doping. His endorsement, his own cancer foundation. I think about it's living a lie. I didn't live a lot of lies. But I lived one big one. You know, it's different, i guess. Reporter: In the astonishing up close and personal documentary, the armstrong lie, the former champion looks shell-shocked at times. I certainly was very confident that I would never be caught. Reporter: Oscar-winning filmmaker alex gidny traveled the world with armstrong. First, to make a feel-good story about the champion. This fairy tale just goes on and on. Reporter: That plan was scrapped as armstrong's life came unglued. But he had armstrong's trust and was there to capture a completely different story as it unfolded. This is a guy who is used to winning. And I think you can see the defeat in his physical posture. And also, a real vulnerability, which is very unusual for lance. Life, for me at the time, was moving fast. Look at 2005. I had won seven tours in a row. I was engaged to a beautiful rock star. I was -- that all just felt normal to me. Reporter: The film won't be released until november. Abc news was given exclusive advanced clips, just armstrong faces more bad news. A judge has ordered that he must finally testify under oath about exactly how he cheated, as part of a multimillion-dollar civil suit. "The armstrong lie" coming to a big screen and a courtroom. A story far from its final chapter. For "good morning america," neal karlinsky, abc news, seattle.

This transcript has been automatically generated and may not be 100% accurate.

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