Nadzeya Ostapchuk

Nadzeya Ostapchuk is a Belarusian shot putter. She briefly became the Olympic Champion in 2012, but was subsequently stripped of the title for failing a drug test and the gold medal was awarded to New Zealand shot putter Valerie Adams. She was World Champion in 2005, but in March 2013, the IAAF reported that her drug test sample from that event had been retested and found to be positive.

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Source: Wikipedia