A polo star who taught Britain's Princes William and Harry has died following a freak accident during a match in Florida.

Carlos Gracida was crushed by his own horse during a match on Tuesday (26Feb14) after the animal was hit in the head by a mallet and collapsed.

The 53 year old was taken by helicopter to a local medical centre, where he later passed away.

Gracida was a star of the sport, triumphing in major polo tournaments around the world including the U.S. Open, which he won nine times, and the British Open, where he was a 10-time victor.

He is also said to have coached British royal Charles, Prince of Wales, as well as his two sons William and Harry.