Crap, after watching episode 5 there was something I completely missed in episode 4.
I didn't realize that Carol had also been taken out... I only realized it when Darrel was at the graves in episode 5 and had placed a flower on one and recalled that I didn't see Carol during that whole episode. So I skimmed back over episode 4 and saw the part with the zombies eating a corpse that Rick and Darrel found. I thought that was T Dogg's corpse... then realized the rag that Darrel picked up next to it was the one Carol was wearing.