Fellow (and new ones here on sqlteam.com) 'SQL Geeks', apparently Mr. Henderson passed away this past Sunday. The blog stating this is located here http://blogs.msdn.com/sqlrem/archive/2008/01/28/ken-henderson-we-will-always-remember-you.aspx?CommentPosted=true#commentmessage

When I wrote my first (and only to this date) lead author book it was on a non-BI topic, SQLCLR. I personally have a background in all facets of MS SQL (to some degree). ANYWAY, the point is, my publishing company pretty much said that Ken's 'guru' books was the target of what we wanted. At the end of the day, I nor could anyone else come close to the quality of content Ken's Guru Guide's contained (in this case on SQL Dev topics). He was one of us and then some...I did not know Ken personally but though his passion for SQL Server and writing I very much identified with him. He will not be forgotten...