In a fittingly tragic death, Dr. Mark Greene died from a brain tumor in ER season 8, episode 21, "On The Beach." After an extended battle with brain cancer that includes several ups and downs ...
2) “ER” was excellent television ... He ultimately succumbed to a brain tumor at the end of Season 8 in one of the show’s most heart-wrenching episodes. When that episode aired, I was ...
After surviving a brain tumor in season 7, Dr. Mark Greene succumbed to relapse in ER's season 8 episode 21, "On The Beach." Edwards was the only original cast member to die in the series.