Derek writes that Chuck Yerkes passed away in a motorcycle accident (copy on this page).
He sent a mail to the perl.org list-owner address late that afternoon and I replied to it just in the hour before the accident. Freaky. I didn't know him, barely even by reputation, but from reading the memorial wiki, he seems to have been a great for everyone who had a chance to know him. Hopefully they use Unix servers where he is now too. :-)