Dr. John Truman Carter III, portrayed by Noah Wyle, is a fictional character from the American television series ER. ... Wyle decided to leave the show as a regular character at the conclusion of season 11, despite offers to stay.

Why did Noah Wyle break from ER?

Noah Wyle says ER exit was "horrible" and admits he "hated" one of his co-stars. ... Wyle explained that the birth of his first child Owen in November 2002 led him to leave the show, although he would later return for a handful of episodes in the final season.

What happened to Noah Wyle on ER?

Wyle played Dr. John Carter, starring in 254 episodes throughout the show's 15 seasons, which is the most of any actor on ER. ... Behind the camera, Wyle has been a producer — working on Falling Skies, Shot, The Librarians and A Killer Story — and a director. He also wrote two episodes of The Librarians in 2016 and 2017.