Why ER Killed Off Dr. Mark Greene In Season 8

Airing for roughly fifteen years, ER saw the death and abrupt exits of many beloved characters, most notably Dr. Mark Greene in ER season 8 – but why did actor Anthony Edwards leave ER? Created by physician and sci-fi novelist Michael Crichton (creator of Jurassic Park and Westworld), ER made its debut on NBC in 1994, achieving overwhelming success with a total of 331 episodes over the course of 15 seasons before ending in 2009, making it the second-longest-running medical drama behind Grey’s Anatomy. Like Grey’s Anatomy, many cast members came and went over the course of the long-running series, but Dr. Mark Greene was there for more than half of the show’s run.