Chyler Leigh – Lexie Grey Then

Lexie, Meredith's half-sister, wanted a close relationship with her. She had a tumultuous on-and-off romance with Mark Sloan, who fathered a child with Callie Torres.

In season eight, Lexie and Mark tragically died in a plane crash. Chyler Leigh worked with the show's creators to ensure her exit was handled properly.

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