Disgraced cyclist Lance Armstrong says he will not cooperate with American anti-doping investigators, despite having said he would help clean up cycling.
The former athlete had until Wednesday to respond to a request from US officials, who had wanted him to tell them everything he knows about drug use in the sport.
But his lawyer announced Armstrong - who last month admitted using drugs to Oprah Winfrey - would not take part in any interviews.
The US Anti Doping Agency (USADA) had told him he must take part if he wanted to reduce the lifetime ban on taking part in sports he had previously received.
His lawyer Tim Herman said Armstrong would not participate in the process as it was designed "only to demonise selected individuals".
USADA had been negotiating with Armstrong's representatives for more than two months before the announcement.
Armstrong had previously said he was willing to participate in an international effort to clean up cycling.
The former cyclist was at the top of his sport for years, winning the Tour de France seven times during a career that also saw him take other titles.
His success made him rich as sponsors queued up to be associated with his name
In January, he admitted to taking performance enhancing drugs in order to win the seven Tour de France titles. He has now been stripped of the titles.
His confession to taking part in doping has caused the former road cycling star a number of problems.
He is being sued by a Dallas-based promotions company which is seeking to recoup £7.6m in bonuses they paid him for winning the Tour de France.
The US Anti Doping Agency has been locked in a war of words with Armstrong for some time and last month - after his confession - accused him of lying when he claimed he was clean when he made his comeback in 2009.
Armstrong claimed on the Oprah interview he should be given the opportunity to compete again, saying that his life ban felt like a "death penalty".
He told the chat show host: "I can't lie to you. I'd love the opportunity to be able to compete, but that isn't the reason that I'm doing this.
"Frankly, this might not be the most popular answer, but I think I deserve it."
An estimated 3.2 million Americans tuned in to watch Winfrey's interview with him.
It has since been announced Paramount Pictures and producer JJ Abram are planning a film of the cyclist's life.