Following his football coaching career, he received a medical degree from the University of Maryland School of Medicine in 1907, and entered into medical practice in his hometown of Raleigh.
During World War I, McKee achieved the rank of major in the American Expeditionary Forces as a field surgeon with the 1st Gas Regiment.
Durante a Primeira Guerra Mundial, McKee alcançou o ranque de major nas Forças Expedicionárias Americanas como cirurgião de campo com o 1.° Regimento de Gás.
Durante a Primeira Guerra Mundial, McKee alcançou o ranque de major nas Forças Expedicionárias Americanas como cirurgiã de campo com o 1.° Regimento de Gás.