Lance Armstrong called it quits late Thursday in his battle to end an investigation by the U.S. Anti-Doping Agency, and the organization said it will strip Armstrong of his strip him of his titles, including seven Tour de France victories.

The move comes three days after a federal judge dismissed Armstrong's most recent lawsuit aimed at halting the case.

The USADA a quasi-government agency recognized as the official anti-doping agency for Olympic, Pan American and Paralympic sports in the United States has accused Armstrong of using, possessing, trafficking and giving to others performance-enhancing drugs, as well as covering up doping violations.

Armstrong maintained he's never tested positive for performance-enhancing drugs and accused the USADA of being out to get a "big fish" to justify the agency's existence.

Armstrong said his decision is not an admission of guilt.

“USADA cannot assert control of a professional international sport and attempt to strip my seven Tour de France titles,” he said. “I know who won those seven Tours, my teammates know who won those seven Tours, and everyone I competed against knows who won those seven Tours.”

The 40-year-old Armstrong faces a lifetime cycling ban.  Armstrong won the tour each year from 1999 to 2005, most of those for a team sponsored by the U.S. Postal Service. He retired twice from cycling first in 2005, for four years, and again in 2011.