I'm so saddened by this... I never met Mike but I we shared many emails over the past year or so while we collaborated on an Android app. I felt I knew him, and I wish I could have met him.
As I just wrote on FB:
"I just learned that Mike Truffer, the skydiver with whom I developed an Android app for organizing skydives (called "Skydiving Formations") during the past year, died. I am in shock. I never met nor spoke with Mike, but I always looked forward to meeting him some day. Our interaction was purely via email, but I feel I knew him - his warm and honest personality came through clearly in his words. He was a joy to work with, trusting and trustworthy, and he spoke his mind always. RIP, Mike. May the app we developed together (he supplied the artwork, and I did the code) carry your legacy for a long, long, time."