Donald Mercer was a patient at Grey Sloan Memorial Hospital.
When Donald needed a kidney transplant to save his life, his best friend, Thom, offered to donate his.
Four months after the kidney transplant, Donald was in a car accident. He went through the windshield and fractured his skull, causing brain death. His wife consented to his organs being donated, but before they could harvest them, Donald became unstable and suffered cardiac death.
Donald was married to Marie Mercer until his death.
Thom was Donald’s best friend from seventh grade until his death. They were very close, to the point where Thom donated a kidney when Donald needed one. Thom was distraught when Donald died.