The whole episode seemed like foreshadowing to me, Glenn having to talk to Rick one last time, the one guy that got bit being afraid he wasn't going to see his wife again (same as Glenn), I just knew something horrible was going to happen. I do believe he is dead and while I will miss the character it is a perfect statement as to just how awful this world has become. I'm just glad we didn't lose Rick too, because I thought it was going to happen as well.
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