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Ever since cyclist Lance Armstrong won the first of his seven Tours de France in 1999, Sunday Times chief sports writer David Walsh has been fighting to unmask the truth about the American’s incredible performances. Faced with Walsh’s allegations against him, Armstrong always denied everything and even resorted to legal action to defend his reputation. But he could not keep everyone silent, and in 2012 Walsh’s long fight to reveal the truth was finally vindicated and Armstrong stripped of his titles. In an interview with the US chat show host Oprah Winfrey in January this year, Armstrong finally admitted that he had taken performance-enhancing drugs during all seven of his Tour wins.

Looking back over 13 extraordinary years, Walsh talks about Armstrong’s fall from grace and his own part in this most extraordinary of stories.