One of the world's leading investigators into the illegal trade in ivory and rhino horn has been killed in Kenya.
Esmond Bradley-Martin, 75, was found with a stab wound to his neck at home in the capital Nairobi on Sunday.
The former UN special envoy for rhino conservation was known for his undercover work establishing black-market prices.
The US citizen had recently returned from a research trip to Myanmar.
Bradley-Martin was in the process of writing up his findings when he died, reports the BBC's Alastair Leithead from Nairobi.
His wife found him in their house in Langata. Police are investigating the circumstances but suspect it was a botched robbery.
BBC correspondent says Bradley-Martin had spent decades risking his life to secretly photograph and document the illegal sales in ivory and rhino horn, travelling to China, Vietnam, and Laos to pose as buyers - helping establish black market prices.
He had first come to Kenya from the US in the 1970s when there was a surge in the number of elephants being killed for their ivory.
His work on illegal wildlife markets helped pressure China to ban the rhino horn trade in the 1990s, and domestic ivory sales, which came into force this year.
Fellow conservationists have been paying tribute to him on social media.