Sprinter Sha'Carri Richardson will not run in the US Olympic 4x100-metre relay team after she accepted a one-month ban for testing for cannabis.Â
The 21-year-old won the 100m at the US Olympic trials in Oregon in June and earlier this year ran the sixth-fastest time in history.
Supporters of the Texan had hoped she could take part in the relay in Tokyo as the ban expires on 28 June.
But US Athletics announced the full squad on Tuesday, without Richardson.
She said she had used cannabis as a way of coping after the death of her biological mother.
"I apologise for the fact that I didn't even know how to control my emotions or deal with that during that time," she told a US broadcaster on Friday.
Richardson had already suggested she would not be competing in Tokyo.