Edward Herrmann
Episode: Season 4, episodes 3, 4, and 5: "Let the Truth Sting," The Heart of the Matter," and "Haunt You Every Day"
The late Hermann, most famous for playing Richard Gilmore on Gilmore Girls, appeared as Norman Shales, "World's Oldest Intern," on the third season. After thirty years in pharmacy, Dr. Shales enters Seattle Grace as an intern, where he is frequently confused for an attending due to his age. He suffers a stroke during surgery, and eventually transfers from surgical residency into psych, because he thinks all the surgeons could use a good shrink.