Lance Armstrong: Enough is enough

Lance Armstrong says he will no longer fight charges from the U.S. Anti-Doping Agency that he used performance-enhancing drugs during his cycling career.

For more on the story, click here.

To see a clip of the 60 Minutes interview from last May in which Armstrong's former teammate, Tyler Hamilton, tells Scott Pelley that he witnessed Armstrong use performance-enhancing drugs, and participated in the doping himself, watch the below video.

To read Lance Armstrong's statement on why he came to his decision, click here.