Former Olympic swimmer Helen Hart, who represented Britain in the 2000 Summer Games in Sydney, has died suddenly at the age of 43. The cause of death has not been disclosed. After her swimming career, Hart worked as a school principal at Worsley Mesnes Community Primary School in Wigan, England. She competed under her maiden name, Don-Duncan, and represented Britain in the 50-meter and 200-meter backstroke events during the Olympics. Tributes have poured in from friends and teammates across the swimming community.