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ER is the TV series in which Goran Višnjić played Dr. Luka Kovač. The medical drama series, which aired from 1994 to 2009, followed the lives of the staff at County General Hospital in Chicago. Višnjić joined the cast in the sixth season and remained a main character until the show's fifteenth and final season. His portrayal of the Croatian-born doctor earned him critical acclaim and a loyal fan base.