I didn't know Drew that well, but I did remember him as an incredibly talented programmer and all around good guy. I was always at devcon and so was he.

I have been on the bridge he fell from in Yellowstone and it is a pretty good drop. I can't figure how he might have fallen by accident though. Maybe it's just the cop in me, but it doesn't pass the smell test.
Hopefully, someone will come forward with more information.