Steele Johnson, a silver medalist in diving in the 2016 Rio Olympics, withdrew during the U.S. Olympic Trials on Tuesday because of a lingering right-foot injury.
He made the announcement on Instagram after the semifinal round of his first event.
"This is hard for me to write, but I've unfortunately had to make the tough decision to pull out of all competition at the Olympic Trials due to my foot injury," wrote Johnson, who will turn 25 next week. "I've endured 2 failed surgeries, years on and off of crutches and have pushed as hard as I physically can. ... I've been through hell and back with my foot and desperately need this pain to stop."
He added he is struggling to walk.
Johnson and David Boudia finished second in Rio in the 10-meter synchronized platform competition in 2016. The two were in third place in the synchronized springboard at this year's Olympic Trials before withdrawing from the event.
Boudia will continue in the competition in Indianapolis in individual springboard, which starts Wednesday.
Johnson, who was a member of the Purdue diving team, won five NCAA championships and is a 14-time senior national champion.
--Field Level Media