who plays derek's sister nancy on grey's anatomy
Embeth Davidtz In Junebug (2005), Davidtz played an outsider art dealer from Chicago brought to North Carolina by her husband (Alessandro Nivola) to meet his family for the first time. Davidtz has also guest-starred on the hit ABC drama series Grey's Anatomy as Dr. Derek Shepherd's sister Nancy in the Season 3 episode "Let the Angels Commit". In 2008, she had a regular role on HBO's In Treatment as Amy, part of a fractious couple alongside Josh Charles's Jake.