ER - Season 12 Episode 13 Body and Soul Life. Death. Chaos. It's all in a day's work.
Overview: Dr. Nate Lennox, a former professor with ALS, is brought in as the progression of his disease is chronicled through his own flashbacks as he is treated by each of the doctors at one point. As Lennox wants to give up, Abby fights to convince him to keep on fighting.