<P> 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 . </P>
<P> 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 . </P>
who plays derek 's sister nancy on grey 's anatomy
who plays derek 's sister nancy on grey 's anatomy
Davidtz
Davidtz