Jessica Ennis-Hill, who won heptathlon gold for Great Britain at the London 2012 Olympics, has retired from athletics.
The 30-year-old had hinted at retirement after winning a silver medal at the Rio Olympics in August.
In a post on social media, Ennis-Hill - also a double world champion - said it was "one of the toughest decisions I've had to make".
"I've always said I wanted to leave on a high and have no regrets," she added.