Car accidents. Gary Seven, in the Star Trek episode "Assignment: Earth" had a strong opinion on that: "What a waste".
People who don't contribute to our future also are lost to car accidents. It happens. But this guy was apparently so multi-talented, and applied his talents to the public good.
I cannot honestly say that I will miss him. I did not even know who he was until now. But I do sense a loss. There are so many people whom we depend upon, in our open source communty, whom we do not even know.