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I briefly looked into this.  He's most probably still alive from what I've seen. He's been tweeting non stop for the last couple of days.

https://twitter.com/snowden?lang=en

Recent Videos:
Its only getting better
https://youtube.com/watch?v=ysCQfx-UEpA

The evidence for dead was very weak, the evidence for alive is very strong.  We'll know for sure at his next teleconference.