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Amy (Emma Bell)
Death episode: "Vatos" / "Wildfire"
How it happened: Andrea's sister, Amy fell victim to walkers during the campsite attack.
Shock factor: Although not technically a full-time cast member, Amy was the first prominent character to die. Her death was sudden, violent and made all the more memorable because Andrea let her turn into a walker (in the following episode) before putting her down for good in a highly emotional scene.