ERAfter 15 seasons, NBC’s groundbreaking medical drama “ER” checked out for the last time Thursday – and fans turned out in droves to say goodbye.

According to Nielsen estimates, the two-hour series finale was seen by 16.2 million viewers, the show’s largest audience in nearly three years.

It was also the most-watched drama series finale since CBS’ “Murder She Wrote” bowed out in 1996 with 16.5 million viewers.

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