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T-Dog (IronE Singleton)
Death episode: "Killer Within"
How it happened: First he's bitten when the walkers infiltrate the prison. Then he sacrifices himself as a human shield, running into two walkers who instantly start devouring his flesh but allowing Carol enough time to escape.
Shock factor: Poor T-Dog had been around from the second episode, but seemed to disappear for episodes at a time. Just when it was starting to feel like he might become a more developed character in Season 3, his borrowed time ran out.