Alpha Protocol - Non Lethal Path [Updated]

From Obsidian's tweets comes the surprising news that Alpha Protocol can be completed with killing anyone.  Obviously that could mean a number of things and my headline may not be strictly accurate but I look forward to finding out:

Learned yesterday that it's possible to get through Alpha Protocol without killing anyone. That's kind of awesome.

Edited: Several readers have pointed out that existing information suggests this is a combination of stealth and non-lethal takedowns.  Hit the comments for the conversation.