Swiss police have said the fatal wingdiving accident occurred among a group who were in the region as guests of a company that makes extreme sport films for the internet.
Although police have yet to confirm the victim's identity, he is understood to be Olympic stuntman Mark Sutton.
Police, though, said: "The victim, a Briton, was 42 years old. He was staying in Chamonix (in France) with 20 followers, considered among the best in the world in this discipline."
More top news
A freezing, frosty night for some of us, milder for others
Researchers are developing vaccines for new, emerging and unknown diseases before they cause global health emergencies.
Barack Obama urged Donald Trump to "go forward with his vision and his values", as he warned of "complexities" in office.