Three major characters are leaving Glee after the show’s third season according to series co-creator Ryan Murphy. Lea Michele, Chris Colfer and Cory Montieth will be out of work when the show’s fourth season premieres. Murphy says the casting shake up is due to the fact that he is trying to be realistic and really true to life because when the show started, the cast members were sophomores and they should graduate at the end of their senior year. Michele and Colfer are said to be on board with Murphy’s decision to write their characters off the show. Murphy warns that more characters are leaving than are staying but he won’t reveal the rest of the cast’s fate until the show’s September 20th premiere.