^ Pretty much what Vapor said. To give my brief two cents, though: I personally think he's dead. A knife to the chest (plus his "death gasp" immediately right after) is pretty indicative of death. Though yeah, maybe his armor cushioned the impact a little bit, but that would still leave him pretty badly wounded.
I don't really consider the video game to be canon. I think like the TV series, the story writers probably just looked at what they could use and didn't really pay attention to the logical sense of it. :P
Anyway, I agree that leaving it at "Unknown" is what's most accurate. I already went and made the change to the article.
I also might as well leave a link to the question someone asked on the Answers Wiki:
Was Wolf Boss really killed by Shen's throwing knife?