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
Some of the key players have praised her landmark speech - but critics say it is too light on detail and time is running out to sign a deal.
A comparatively quiet reception greeted the launch of the new iPhone 8 and 8 Plus - a far cry from the crowds of years gone by.
Footage shows the dangerous rescue effort after the family were left at the mercy of the sea on a boat overturned by Hurricane Maria.