She won the gold medal in the women's 400m hurdles at the 2004 Summer Olympics in Athens.

On 16 August 2008, during the 2008 Summer Olympics in Beijing it was announced that she tested positive for the banned substance methyltrienolone.

[5] On 26 November 2008, the Greek Athletics Federation announced that she would serve a two year ban from the sport effective from August when Chalkia was expelled from the 2008 Summer Olympics.

[7] The court ruled that the former champion had fallen victim to a circuit of adulterated drugs, and also acquitted her trainer Giorgos Panagiotopoulos, who was facing charges of intentionally supplying banned substances.

You can help Wikipedia by expanding it.This biographical article relating to Greek athletics is a stub.