Rex made his Paralympic debut in Tel Aviv 1968 Paralympic Games as part of the first ever New Zealand Paralympic Team. He competed in Para athletics, throwing the javelin and in Para weightlifting in the Featherweight class. Rex pressed 87.5 kilos and placed 11th from 12 competitors. He was a wheelchair user since the age of 15 after a hunting accident.
Rex was born in Reefton and passed away suddenly with family by his side in ICU at Christchurch Hospital in 2017, aged 76 years.