One of the world's leading conservationists has been stabbed to death at his home in Kenya.
Bradley Martin had moved to Kenya in the early 1970s and specialised in undercover operations that exposed the international trade in illegal ivory.
Mr Martin was found dead at his home outside Nairobi on Sunday afternoon with a single stab wound to his neck.
His research credited as one of the main reasons China outlawed its domestic trade in rhino horn and eventually ivory.
Others in the area of wildlife conservation say the gap left by Mr Martin's death will be keenly felt.
"You know it's a huge... gaping hole in the conservation world when you lose somebody who really was at the forefront of one of the most important areas of work when it comes to saving elephants," says wildlife conservationist Paula Kahumbu.
At the time of his death Mr Martin was working on a report on the illegal ivory trade in China's neighbours of Laos and Myanmar.
It was dangerous work, but Kenyan police are treating his death as a robbery.