USADA also accuses Armstrong to be a "ring-leader" of systematic doping on his Tour de France winning teams

US cycling star Lance Armstrong has announced he'll almost certainly not fight drug charges from the US anti-doping agency, ahead of a Friday deadline.

Nike Free Joggesko In a statement, the 40-year-old maintains they are innocent, but says he or she is weary of the "nonsense" accusations.

America anti-doping agency (USADA) now says it'll ban Armstrong from cycling forever and strip him of his seven Tour de France titles.

Armstrong retired from professional sport in 2011.

USADA alleges he used banned substances dating back 1996, such as blood-booster EPO, steroid and blood transfusions.

Armstrong sued in federal court to close the costs but lost. Nike Free Dame

'Heartbreaking' case

"There comes an area in every man's life when he needs to say, 'Enough will do.' For me personally, that time has become," Armstrong said in the statement.

"I have been managing claims which i cheated together with an unfair advantage in winning my seven Tours since 1999. Nike Free

"In the last 3 years, Image afflicted by a couple-year federal criminal investigation then Travis Tygart's [USADA's leader] unconstitutional witch hunt.

"The toll this has taken on my family, and my help our foundation and also on me leads me to where My business is today - finished with this nonsense."

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Lance Armstrong factfile
Born: Plano, Texas
Teams: Motorola, Cofidis, US Postal, Discovery Channel, Livestrong, Astana, Team RadioShack
Tour de France: 1999, 2000, 2001, 2002, 2003, 2004, 2005 (22 individual stage wins)
World Championships road race: 1993
Armstrong had been administered until 06:00 GMT on Friday to determine if you should continue fighting the USADA charges.

The agency says that 10 of Armstrong's former teammates are able to testify against him.

The cyclist has accused USADA of offering "corrupt inducements" with riders.

USADA also accuses Armstrong to be a "ring-leader" of systematic doping on his Tour de France winning teams.

Mr Tygart said soon there after Armstrong's statement that his agency would ban Armstrong from cycling for lifetime and strip him of his titles, according to AP.

The chief executive described the situation to be a "heartbreaking" instance of victory-at-every cost way of sports.

However, Armstrong disputed which the USADA has the strength to adopt away his titles.

"USADA lacks jurisdiction extending its love to bring these charges," his statement said.

The cycling brass the International Cycling Union (UCI) - that have backed Armstrong's challenge to challenge USADA's authority - has up to now made no public comments about the latest developments.

Armstrong, who survived seminoma previous to his record-breaking Tour wins, retired following the 2005 Tour de France but launched a comeback during the past year.

He retired for the second amount of time in February 2011.

He now says he'll be concentrating on the effort in reference to his cancer charity.