(CNN) -- Sprinter Shawn Crawford might have been coming to the latter part of his athletics career, but his failure to inform doping regulators as to his "whereabouts" has landed the Olympic gold medalist with a two-year ban.
The American, who sprinted to 200 meter gold at the Athens 2004 Games, has been sanctioned after failing to provide the United States Anti-Doping Agency (USADA) with a location for drug testing three times during the past 18 months.
The "whereabouts" rule requires athletes in advance to tell regulators where they are for one hour every day and make themselves available at that time for a drug's test.
The ban means results recorded or prize money won by Crawford on or after November 17, 2012 have been scratched.
CNN contacted Crawford's representative to ask if he will appeal the ban, but the agent was not immediately available for comment.
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Just six days after bomb blasts rocked the Boston Marathon, London will hold its own race, pledging to observe a 30-second silence in solidarity with U.S. victims.
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The forecasted cost of the Olympics and Paralympics is £8.921 billion ($14.236 billion). The English capital became the first city to host the Games on three occasions.
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"Shawn Crawford of Culver City, Calif., an athlete in the sport of track & field, has received a two-year suspension for committing an anti-doping rule violation in which he failed to file his whereabouts information," read a USADA statement.
"Crawford failed to comply with the whereabouts requirements and, as a result, accrued three whereabouts failures within an 18-month period.
"A whereabouts failure for National Testing Pool athletes includes failure to provide required quarterly whereabouts filings and/or failure to be available for testing due to inaccurate or incomplete information provided by the athlete.
"USADA is responsible for the testing and results management process for athletes in the U.S. Olympic and Paralympic Movement, and is equally dedicated to preserving the integrity of sport through research initiatives and educational programs."
As well as gold in Athens, which was clinched with a time of 19.79 seconds, Crawford won a silver medal as part of the U.S. 4 x 100 meter relay team.
He was awarded the silver medal in the 200m final at the Beijing Games of 2008 after Churandy Martina was punished for outside of his lane.
According to the Associated Press, Crawford later gave his medal to Martina.
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Competitors will be urged to wear black ribbons to show their support for Boston, after explosions killed three people and wounded more than 180.
Security will be stepped-up at the event, with politicians pointing to the smooth delivery of last year's Olympics to reassure runners and spectators.
"Obviously, in light of what happened in Boston, we've had to have a look at security and we have a detailed and well-thought-out plan with the Metropolitan Police which we have year-in, year-out," sais London Marathon chief executive Nigel Bitel.
The haunting image of bloodied victims in the Boston attack will no doubt loom large in the minds of Londoners who have vowed to show their support on Sunday.
The future of the Olympic Stadium has yet to be decided. English Premier League football club West Ham United has bid to move into the arena, along with third-tier team Leyton Orient, a football business college and a group who hope to host Formula One races there.
Workmen have already begun the task of transforming the Olympic site.
The wrapping which surrounded the stadium is to go as part of the renovation.
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