Tyler Hamilton - Former professional cyclist
For years, it's been one of the biggest questions in sport. Did Lance Armstrong, the seven-time winner of cycling's greatest race, the Tour de France, dope? Is the man who beat cancer to become one of the greatest sporting figures ever, a cheat? Armstrong has denied wrongdoing. But now a former teammate and roommate of Armstrong's, Tyler Hamilton, has produced the most detailed and wounding set of allegations yet. Is Hamilton self-serving and greedy, as Armstrong insists? Or a shaft of light on a sport that's been mired in murk?