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Nothing is known about Erin's life prior to or as the outbreak began.
As Rick Grimes, Carl Grimes, and Michonne drive to King County, a sign is seen on the side of the road that says "Erin: We tried for Stone Mountain. -J". As Rick's car gets stuck in the mud, several zombies surround the car, including a woman with a bracelet that reads "Erin". Erin and the other walkers are then gunned down by Rick in an attempt to clear the area. Her body is left on the side of the road with the other dead zombies.
- Killed By
- Unknown Cause (Alive)
At some point during the apocalypse, Erin died due to unknown causes and reanimated.
- Rick Grimes (Zombified)
Rick shoots a zombified Erin after she attempts to get into his vehicle.
- "Clear" (Zombified)
- Erin shares the same name as her actress, Erin Leigh Bushko.