One? Heselden's the only one to come immediately to mind. That the owner of the company should drive its product off a fatally high cliff is embarrassing, but still quite literally n=1.
I know of at least one fatality in my acquaintance circle. "A drunkard cracks his skull when falling from a Segway onto hard pavement in a tourist zone" isn't the kind of story that makes international news, unlike Heselden's demise.
