The person also said Armstrong apologized for letting the staff down and putting Livestrong at risk but he did not make a direct confession to using banned drugs. He said he would try to restore the foundation's reputation, and urged the group to continue fighting for the charity's mission of helping cancer patients and their families.
Armstrong spoke to a room full of about 100 staff members for about 20 minutes, expressing regret for everything the controversy has put them through, the person said. He told them how much the foundation means to him and that he considers the people who work there to be like members of his family. None of the people in the room challenged Armstrong over his long denials of doping.
Winfrey and her crew had earlier said they would film Monday's session at Armstrong's home. As a result, local and international news crews were encamped near the cyclist's Spanish-style villa before dawn.
Armstrong still managed to slip away for a run despite the crowds outside his home. He returned by cutting through a neighbor's yard and hopping a fence.
Jim Litke reported from Chicago.