Russia's Natalia Antyukh loses Olympic gold after not appealing ban

She won the 400 metres hurdles title at the 2012 Olympics defeating American Lashinda Demus, who will be upgraded to gold once the International Olympic Committee (IOC) acts on the AIU ruling.

In October, the AIU had disqualified Antyukh's results from July 2012 to June 2013 "for the use of a prohibited substance/method." The ruling became final and binding with the athlete not appealing the decision within the stipulated 45 days.

"The IOC may now proceed with the reallocation of medals and the update of the IOC database," noted the AIU's correspondence to the IOC.

Antyukh is serving a four-year ban until 2025 for breaking anti-doping rules. The ruling was handed down last year by the Court of Arbitration for Sport.

Several Russian athletes have had their medals from the 2012 Games stripped due to anti-doping rule violations.