My condolences. So sorry for your loss.
Typing things to someone you've never met over the internet seems so futile in the face of such a thing...cant think of damned thing worth saying thats doesnt sound like a platitude, condescension or a bloody hallmark card. Save maybe that he was obviously a good man, and I'm glad you've taken the best of what he had to show you with you. Theres a lesson in that for all of us.
Sympathies and best wishes
Mark