|Representing New Zealand|
|British Empire and Commonwealth Games|
|1966 Kingston||440 yards Medley Relay|
At the 1966 British Empire and Commonwealth Games he won the bronze medal in the men's 440 yards medley relay. He also competed individually in the men's 100 and 220 yards backstroke, finishing 4th and 6th in each final respectively. Additionally O'Carroll swam in the 110 yards freestyle event.
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