Derek was the editor of Quill and Quire, Canada's book industry magazine. I only met him a few times at trade events, but he always struck me a very friendly, approachable man who greatly enjoyed both his job and the people his work brought him into contact with.
Apparently he had been sick for some time. He was a hell of a nice man, and has been taken far too soon. He will be sorely missed.
More news of his passing can be found here.