Nurse! Is long-running medical drama "ER" ready to close its hospital doors?

It's true! Code blue! NBC has announced that "ER" will come to an end after 15 seasons and numerous Emmy awards. The show will wrap with a two-hour series finale on March 12.

"ER" is NBC's second longest-running drama, after "Law & Order." It is also the longest-running American primetime medical drama of all time.