James Le Mesurier

James Gustaf Edward Le Mesurier (25 May 1971 – 11 November 2019) was the British military personnel, humanitarian and volunteer worker. He co-founder of the White Helmets, a volunteer civil defence organisation in the Syrian Civil War. He was a British Army officer in the 1990s and also worked with the United Nations peacekeeping force in the former Yugoslavia. 
He was also the director of the non-profit Mayday Rescue Foundation.
On 11 November 2019, Le Mesurier was found dead in the street of Beyoğlu, Istanbul, in what appears to have been a fall from his balcony. Le Mesurier was found with fractures to his head and legs. The cause of the fall or exact cause of death is under investigation.