Viktoriya Tereshchuk, the bronze medallist in the women's pentathlon at the Beijing Olympics has been stripped of her medal for a failed doping test.
The Ukrainian tested positive to the anabolic steroid turinabol, the IOC said.
Tereshchuk, a world champion in 2011, could face further sanctions, including a ban imposed by the sport's governing body.
Anastasiya Prokopenko of Belarus, who finished fourth in Beijing, is next in line for the bronze medal.
More than 100 athletes have so far tested positive in re-tests of samples taken during the London 2012 and Beijing 2008 Olympics.
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