NEW YORK -- Tyler Hamilton says writing his tell-all book about Lance Armstrong felt like taking "a thousand-pound backpack" off his shoulders.
Hamilton tells The Associated Press he always thought he'd take some of the secrets about doping and cycling to the grave with him.
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But he says his world changed when he received a subpoena to testify to a grand jury looking into the Armstrong case.
The 41-year-old Hamilton, who rode with Armstrong on the U.S. Postal Service team from 1998 to 2001, details the years he spent lying about using performance-enhancing drugs and his relationship with Armstrong in his book, "The Secret Race, Inside the Hidden World of the Tour de France: Doping, Cover-Ups and Winning at All Costs."
The book was released Wednesday.