added by lexabuti
After Derek walks in on Addison and Mark he ends his relationship with Addison. Addison struggles to keep their marriage together, but Derek is adamant and walks out on her. Addison then moves on.
added by FashionVictim
Jan 2008: Justin Chambers, in a video message on the Oprah show, discusses Grey's Anatomy co-star and friend Katherine Heigl.