Australia's swimming boss Alex Baumann has quit three months into the role for health reasons, the sport's national federation said on Monday.
"As a two-time cancer survivor, I appreciate how important health and family are," the Swimming Australia Chief Executive said in a statement.
"I recognise the timing is difficult but I know I must take this time for myself and my family now."
Canadian Baumann, who won two gold medals in the pool at the 1984 Los Angeles Games, leaves amid a review of Swimming Australia's culture following allegations of abuse by current and former swimmers.
Swimming Australia president Kieren Perkins said an interim CEO would be appointed as soon as possible.
"We're sad to see Alex go. This is a great loss for our sport, but we understand his reasons," he said.
Australian swimming had its best Olympics at Tokyo, winning nine gold medals.
(Reporting by Ian Ransom; Editing by Richard Pullin)
