He bought the company after the product had already been invented. (Now, if Dean Kamen somehow died to a segway...)
Still fits with the theme though. Luis Jiménez didn't invent a sculpture or the Mustang, but still makes the list.
Jiménez certainly designed the thing that killed him. As far as I can tell, Heselden's involvement was just finanical. The deaths are both ironic, but in different ways. FWIW, it was enough to get him on a different list:
>Peng Fan, a chef in Foshan, China, was bitten by a cobra's severed head, which he had cut off 20 minutes earlier while preparing a soup.
My, what a grisly list that is.
"Sam Ballard, 29, died from angiostrongyliasis after eating a garden slug as a dare eight years earlier."
I remember reading about this man but did not know he passed. This joke altered his and many people around him forever. Comedy with absolutely devastating consequences.