who plays her character?
Actress Chyler Leigh.
Lexie Grey
y actress Chyler Leigh.
when do mark and lexie die in grey's anatomy In season 8, While flying with fellow surgeons to separate conjoined twins. how is she related to meredith grey? She is her  younger paternal half-sister. when was she first introduced in the series? Season three
wiki:9163232
Lexie Grey [SEP] Introduction
Alexandra Caroline Grey, M.D. is a fictional character from ABC's medical drama television series "Grey's Anatomy", portrayed by actress Chyler Leigh. Created by series producer Shonda Rhimes, the character is introduced in season three as the titular protagonist's younger paternal half-sister. She transfers to Seattle Grace Hospital as a new surgical intern after her mother's sudden death, and is eventually named a surgical resident in season six. Leigh was originally contracted to appear for a multi-episode story arc but ultimately received star billing from seasons four to eight. She has also reprised her role as Lexie on the spin-off show "Private Practice".