rudy_wayne writes "ZDNet is reporting that Zero Day blogger and malware researcher Dancho Danchev has gone missing since August of last year. Dancho, who was relentless in his pursuit of cyber-criminals, last blogged here on August 18. His personal blog has not been updated since September 11, 2010. 'At ZDNet, we made multiple attempts to contact him, to no avail. Telephone numbers are going to Bulgarian language voicemails and our attempts to reach him via a snail mail address also came up empty. Just recently, a trusted member of the malware research community reached out to us to say he had received a troubling letter from Dancho on September 9, 2010, about the threat of persecution in Bulgaria.'"