`` ER '' ends its NBC run on Thursday , April 2 , after 15 seasons . Law ' Thursday at 10 to 'ER ' Thursday at 10 . ' The show is a spinoff of the hit medical drama E.R. and follows Dr. Ben Garrett ( Michael C. Hall ) as he tries to save his wife from an incurable disease that has killed off most other doctors in The popular show had continued long tradition of drama in 10 p.m. slot . Cable television now drawing audiences for popular dramas .
`` ER '' ends its NBC run on Thursday , April 2 , after 15 seasons . The show is a spinoff of the hit medical drama E.R. and follows Dr. Ben Garrett ( Michael C. Hall ) as he tries to save his wife from an incurable disease that has killed off most other doctors in The popular show had continued long tradition of drama in 10 p.m. slot . Cable television now drawing audiences for popular dramas .