I'm new here as well, but I've read through his memorial threads, as well as the update thread from when it happened.
I know it's always hard to lose a friend, especially one that you know you could have, and should have gotten to know better. I've been there, but the best thing you can do is let his family know how much he was loved, and remind them year after year. Let them know when you think of him 6 months, 2 years, or even 10 years from know. Let them know he still has a place in your heart.
I wish I could have known him, and it's things like this that makes you value the little friendships you make all the more.