Murray Marks

Murray Marks donates his kidney to his father at Sacred Heart Hospital. Murray is an air traffic controller at a very small airport within scooter-driving distance of Sacred Heart. J.D. tracks Murray down when his father is in the hospital needing a kidney transplant. After learning that Gregory Marks isn't his biological father, he decides not to give him the kidney. J.D. talks to him and Murray eventually decides to give him the kidney because Gregory was a "decent" father after all.