Parker Bowles' brother Mark Shand has died after sustaining a serious head injury.
The 62-year-old travel writer and conservationist sustained a serious head injury in a fall, Clarence House confirmed in a statement.
Shand had been taken to hospital in New York.
Shand was chairman of the Elephant Family, a movement which exists to save the endangered Asian elephant in countries like India.
He was in New York for a charity auction.
According to close friends, he reportedly fell and hurt his head on a pavement outside the New York venue and was on life support since Tuesday.