NEW : Media reports say Armstrong admitted to using performance-enhancing drugs . The Associated Press says he has been charged with doping and is expected in court on Monday. The disgraced cycling legend earlier apologized to the staff of the cancer charity Interview with Winfrey lasted 2 1/2 hours , talk show queen tweets . Armstrong apologizes to cancer foundation workers for their stress .
NEW : Media reports say Armstrong admitted to using performance-enhancing drugs . The Associated Press says he has been charged with doping and is expected in court on Monday. Interview with Winfrey lasted 2 1/2 hours , talk show queen tweets . Armstrong apologizes to cancer foundation workers for their stress .