Britain's world No. 1 shooter Amber Hill withdrew from the Tokyo Olympics on Wednesday after she tested positive for COVID-19 before departure, Team GB said in a statement.
Hill, who was due to compete in Olympic Skeet, said she was devastated. She was a finalist at the 2016 Rio de Janeiro Games and was a gold medal prospect for these games.
"There are no words to describe how I'm feeling right now," the 23-year-old said.
"After five years of training and preparation, I'm absolutely devastated to say that last night I received a positive COVID-19 test, meaning I've had to withdraw from Team GB's shooting team.
"I will be back from this, but right now I need some time to reflect and take in what has happened."
Team GB said no replacement would be selected.
Hill, a silver medallist at the 2018 Commonwealth Games, was the most experienced athlete on the British shooting team.