Wow. After 15 years on the air, ER is shutting down with its series finale airing tonight, April 2 on NBC. Watch the ER series finale promo video for a preview of the last episode.

Will you be tuning in tonight to see how ER ends? Tune in for an ER Retrospective at 8 p.m. and the two-hour series finale “And In the End…” at 9 p.m.