Turns out it was a heart attack after all. We were initially told his heart checked out OK, but it turns out there was a major artery that was constricted. It's unfortunate that the first symptom of his heart trouble was death, but at least we know what happened now. I miss him a lot.
Here is some footage of Matt playing his minimal "standup" kit in Blitzen, a short-lived but great band he played in with my old bandmate Jason (leader of Skye Klad) and Jason's wife Chrissy. I think they could have been pretty popular if Jason hadn't abrubtly disbanded the group to pursue more "art" music. This show was at the first Heliotrope festival in 2004.
"Blitzen":
http://www.youtube.com/watch?v=aU0_06STkMw
"John The Revelator":
http://www.youtube.com/watch?v=BsMw-k6DkpA
"Round and Round":
http://www.youtube.com/watch?v=iwcPA-18Zes
"Joan Of Arc":
http://www.youtube.com/watch?v=qlaxGEqTp1w