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Timeline of doping allegations
2010: May - Armstrong's former US Postal team-mate Floyd Landis launches allegations against the Texan.
2011: May - Forced to deny claims made by former team-mate Tyler Hamilton that they took performance-enhancing drugs together.
2012: February - An investigation into alleged doping by Armstrong is dropped by federal prosecutors in California.
June - United States Anti-Doping Agency (USADA) confirms it will file formal doping charges against Armstrong.
July - Armstrong files lawsuit against USADA accusing them of "corrupt inducements" to other cyclists to testify against him.
August 20 - Armstrong's legal action dismissed in court.
August 24 - Armstrong announces he will not fight doping charges filed against him but insists he is innocent. He is stripped of all his titles and banned from cycling for life by USADA.
October 10 - USADA claims 11 of Armstrong's former team-mates have testified against him.
October 22 - Cycling's world governing body, the UCI confirms it has ratified USADA's decision to ban Armstrong from cycling for life and to strip him of his seven Tour de France titles for doping offences.
November 2 - The World Anti-Doping Agency announces it will not appeal USADA's decision.
2013: January 17 - Armstrong admits to doping in a recorded television interview with Oprah Winfrey.