I disagree. He is either conscious and resisting or dead and rigor mortis is setting in.
Wiki (I'm no CSI expert) under "Physical Changes" suggests rigor in muscles other than eyelids, neck and jaw only start some 6 hours after death.
If you look at his left forearm you can see a flexed forearm muscle. To see this just watch your forearm as you move your hand to your shoulder. No flexed muscle.
Now flex your bicep ("muscle-man pose") and watch that muscle/tendon pop up like in the picture.
Ambassador Stevens was either conscious in the picture being "rescued" or was dead for 6+ hours and long past "rescue". FWIW.
In an earlier post (My post: Before and After "Rescue") I suggested he looked a lot more alive and a lot less worse from "wear and tear" in the first picture (post #13 vs #32). Others disagree.
I just hope he wasn't conscious. Wonder if we'll ever know the truth. The bottom line is he is dead and they killed him, who they is really doesn't matter to me. That whole part of the world is a cesspool of hatred.