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Jim (Andrew Rothenberg)
Death episode: "Wildfire"
How it happened: We never actually see him die, but Jim was bit during a massive walker attack on the first campsite.
Shock factor: Jim initially hides his wounds, but once the walker bites are discovered he requests to be left on his own and refuses Rick's offer of a handgun to prevent himself from turning. It's possible he's still wandering the world as a walker, although he's one of the voices Rick hears on the phone in the Season 3 episode "Hounded."