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Donna (Cherie Dvorak)
Death episode: "Made to Suffer"
How it happened: Allen's wife and Ben's mother was in the small group of five survivors led by Tyreese and Sasha, but Donna was bit by a walker shortly before they made it to the prison. She died soon after Carl found them and led them to safety, and Tyreese smashed her head with a hammer to prevent her corpse from turning.
Shock factor: Considering she was dead practically as soon as she was introduced, there was nothing shocking about her demise. Her death was basically a way to establish the dynamic in Tyreese's group (i.e. Sasha is practical, Allen is a jerk, Tyreese is heroic, Ben was whiny).