Mizuki Noguchi, the winner of the women’s marathon gold medal at the 2004 Athens Olympics, announced her retirement on Friday.

Noguchi’s announcement comes after she finished 23rd at the Nagoya Women’s Marathon last month and failed to qualify for this summer’s Rio de Janeiro Olympics.

“I have had a happy athletics career,” Noguchi, 37, told a news conference in Kobe. “I feel refreshed and I am happy that I had so many people supporting me.”