NBC will make one last set of rounds at County General for a 15th and final season of ER, but not all the doctors will be around for rotations.
Maura Tierney (Abby Lockhart) will exit after a few episodes, and Goran Visnjic (who plays Lockhart's love, Luka Kovac) also will leave the show early next season for Abby's exit.
Mekhi Phifer has not yet signed a new contract, although castmates John Stamos, Parminder Nagra and Linda Cardellini will be back.
Looking ahead to the finale, executive producer John Wells would like some former cast members to come back and say goodbye. But apart from Noah Wyle, whose contract calls for him to return for four more episodes, he hasn't made any overtures.