what season of er did mark greene died
Mark Greene Dr. Mark Greene is a fictional medical doctor from the television series ER, portrayed by the actor Anthony Edwards. For most of his time on the series, Greene's role was that of a mediator and occasional authority figure, and he was considered the main character of the series for the first eight seasons. Mark was also the only original character to die, and his death at the end of Season 8 marked one of the biggest turning points in the series.
Claudia Wells After her mother was diagnosed with cancer, Wells said family took precedence and told the studio she would not be available to reprise the role for the two sequels;[1][2] actress Elisabeth Shue replaced her.
Nora Zehetner From late 2009 to mid 2010, she portrayed the recurring role of Dr. Reed Adamson in the popular television series Grey's Anatomy.
Emily Prentiss Brewster returned for guest appearances in the season 9 episode "200" in 2014 and the season 11 episode "Tribute" in early 2016 before returning as a regular cast member in the season 12 episode "Taboo" later in the year.[18]