A man died after a cycling accident at the Aquadrome in Rickmansworth.
Ambulance crews raced to the Aquadrome in Frogmoor Lane on Sunday afternoon after a man came off his bike.
A man in his 50s was rushed to Watford General Hospital in a critical condition but he later died in hospital.
Spokesman for the East of England Ambulance Service Joy Hale said: “We got a call at 5.15pm and the call came in saying a rider had come off his bike and gone into the water.
“We took him to Watford General Hospital and he was in a very critical condition."
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