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Episode: "Into You Like a Train"
Bonnie Crasnoff (Keena) is admitted to Seattle Grace after a horrific train crash in which she and another passenger are impaled by the same metal pole. In order to save the other passenger, whose injuries are slightly less severe, they decide to move Bonnie off the pole, knowing she likely won't survive. She dies, but reappears in Season 3 during Meredith's vision of the afterlife.