His website (harryharrison.com) is reporting that that he passed away yesterday from unknown causes.
He was one of my favorite authors simply because, while he was broadly a Scifi writer, his body of work was so eclectic. Personally, I'll always have a soft spot for The Stainless Steel Rat and Bill, the Galactic Hero, but I also fondly remember The Deathworld Trilogy, which was as dark as the first two were light. I guess I'll be reading some Harrison during sustained silent reading in my classes for the next few weeks.
Ad Astra, Mr. Harrison.
Vocatus atque non vocatus, Deus aderit. -- Erasmus
All others things being equal, the simplest solution is usually stupidity. -- Darwin Minor