This discussion may contain spoilers!
We can clearly see Carver either beating or murdering someone in one of the screens, as we were told via the leaked achievements, here:
Now obviously the big question is: who is the guy?
I think it's this guy:
As the bottom right shows a blue colour, and he's wearing a blue hat/beanie/whatever.
Alternatively, he could be Eddie, seeing as they have a similar hat.
Also, Carver could just be killing a walker, I guess that's what we'll have to wait for to see!