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Gregory Marks was a patient at Sacred Heart Hospital.
Gregory was admitted due to kidney failure, and immediately J.D. took a liking to him. He gave J.D. a journal, and J.D. jokingly vowed to give him his kidney, and was relieved when their blood types didn't match up. J.D. tracked down Gregory's son Murray, and eventually convinced him to donate his kidney to Gregory. ("My Unicorn")
Gregory legitimately loves his son Murray, even though he occasionally does things that show otherwise.
|SEASON FOUR PATIENTS|