Hong Kong: Former Australian world silver medal-winning swimmer Kenneth To has died aged 26 after becoming ill during training in Florida.

Hong Kong-born To moved to Sydney when he was two and won silver as part of the 400-metre medley relay squad at the 2013 World Championships in Barcelona.

Kenneth To, a former swimming world championships medalist for Australia, died on Tuesday after falling ill training with the University of Florida. Credit:AP

He was also a member of the Australian teams at the 2014 Commonwealth Games that captured gold in the 4x100m freestyle and silver in the 4x100m medley, and in 2009 broke Ian Thorpe's decade-old Australian record in the 200m individual medley.

To transferred his nationality to Hong Kong in 2016 and was training to compete at next year's Olympics in Tokyo.