Sam McGinley is the brother of Kayla McGinley, the patient who died in the episode The Mistake. He was portrayed by actor Ryan Hurst. Sam came to the clinic with his sister the day after she suffered tremendous stomach pain during a school talent show. He complained about how long they had to wait. Later, Kayla suffered sepsis and peritonitis from a perforated gastric ulcer and required a liver transplant. Sam managed to rush through the tests to see if he was a compatible donor and offered a lobe of his liver for transplantation. The transplant surgery was successful.