(USA TODAY by Brent Schrotenboer)--Cyclist Lance Armstrong confessed to Oprah Winfrey that he used performance-enhancing drugs to gain an edge in cycling in a lengthy interview Monday, a person familiar with the interview told USA TODAY Sports.
The person requested anonymity because the interview details are supposed to remain confidential until its airing Thursday night.
Armstrong had said he was prepared to "speak candidly" during the interview, which was held in Armstrong's hometown of Austin, Texas.
Winfrey did not share details of the interview, but the iconic talk show host went on Twitter to say the interview lasted more than two and a half hours and Armstrong "came READY!"
Winfrey will appear on CBS This Morning on Tuesday to promote the Armstrong interview, which airs at 9 p.m. EDT Thursday on the Oprah Winfrey Network.
No other details of the interview were immediately available.
Prior to the taping, Armstrong issued an emotional apology to the staff at Livestrong, the charity he founded to support cancer survivors.
Armstrong stepped down from the foundation's board in October after the U.S. Anti-Doping Agency released a massive file of evidence against him that spelled out how and when he used performance-enhancing drugs and blood transfusions to boost his performance.