Les McKeown, of the Bay City Rollers.
I have not found a mainstream source for this yet, but it seems to have been confirmed in various places: Dan Kaminsky, noted security researcher.
His politics were not mine, and he was not a personal friend or even acquaintance of mine. But I was lucky enough to see him speak at DEFCON and Black Hat a few times, and the guy was wicked smart. Especially when it came to TCP/IP and DNS: man probably forgot more about DNS than I’ll ever know. (One of my favorite talks involved him demonstrating how he could run streaming audio, in real-time, over the Internet…by embedding data in DNS queries. I believe this was that talk.)
There’s a good Hacker News thread here, and an obit from The Register here.
The Reg obit also includes a link to a playlist of Mr. Kaminsky’s talks on YouTube.