<P> `` And in the End ... '' is the 331st and final episode of the American television series ER . The two - hour episode aired on April 2 , 2009 and was preceded by a one - hour retrospective special . </P>
<P> `` And in the End ... '' is the 331st and final episode of the American television series ER . The two - hour episode aired on April 2 , 2009 and was preceded by a one - hour retrospective special . </P>
when was the last episode of er aired
when was the last episode of er aired
April 2 , 2009
April 2 , 2009