Mark Shand - the brother of the Duchess of Cornwall - was the chairman of Elephant Family, which aims to save the endangered Asian elephant from extinction in the wild.
In a statement, the charity said it had "lost the head of our family".
The statement on the charity's website reads: "Today we have lost the head of our family. Mark Shand was a true force for conservation.
"He was both a legend and inspiration and above all our great friend. We ask at this time that people’s thoughts are with his loved ones. We will miss him always."
More top news
Despite the sunshine in short supply in the places the next few days - it stays warm and a little humid and close in places.
The surfer was at a popular tourist beach in Costa Rica when the crocodile attacked and bit him several times in the leg and head.
After a mild and quiet night, the best of the sunshine will be across the south east.