Born Joyce Constance Gladys Carpenter, Helleur was born on 15 October 1923. She took up diving when a junior swimming championship was being held in
Nelson: at the suggestion of the pool superintendent, Harry Davy, she entered the diving competition. She went on to win the New Zealand national women's diving championship twice, in 1944 and 1950. Carpenter worked as a physical education instructor. At the 1950 British Empire Games, she finished seventh in the women's 3 m springboard. ==Later life and death==