Leading ivory-trade investigators has been killed in Kenya

Esmond Bradley Martin, one of the world's top ivory investigators, who also helped persuade China to shut down its legal rhino horn and ivory trades, has been killed in Nairobi.

The 75-year-old American was found dead in his house in the Kenyan capital with a stab wound to his neck on Sunday (Feb. 4). Kenyan police said they have yet to identify his attackers, but suspect it was the result of a botched robbery, according to the BBC.

As a leading conservationist, Martin was known for infiltrating and documenting illegal sales of ivory and rhino horns and then publishing the details of his findings. His work exposing the scale of ivory markets took him across the world from the United States to Congo, Nigeria, Angola, China, Hong Kong, Vietnam, Laos, and Myanmar. His research on the dynamics of illegal wildlife markets also provided governments with the data they needed to clamp down on, and eventually shut down both legal and illegal exchanges.

Martin's death comes shortly after China enforced a ban on sales of ivory. The country was the world’s largest importer of ivory, and the trade was responsible for the deaths of as many as 30,000 elephants in Africa a year. Ivory smuggling had also done a lot of damage to China’s alliances with African nations, given the high demand for elephant tusks and rhino horns for use in traditional medicine and decoration. In one of his last research papers published last year, Martin showed that even though the price of ivory declined overall, business was moving from China and Hong Kong to Laos.

Wildlife experts, environmental organizations, and the United Nations said the world had lost a conservationist who was rigorous in his work and reporting. Paula Kahumbu, the chief executive officer of Kenya-based WildlifeDirect, expressed her sadness at Martin's death:

3/3 Esmond was a global authority on ivory and rhino horn trafficking. We send our deepest condolences to his wife. RIP Esmond, pachyderms have lost a great champiom

— Dr. Paula Kahumbu (@paulakahumbu)February 5, 2018

While the motive behind Martin's murder is still unknown, conservationists and environmentalists around the world have been killed for their work in the past. Last year, 197 land and environmental activists were killed for standing up to governments and companies, according to international non-governmental organization Global Witness.