After serving in the U.S. Army in World War II, McKay became executive vice president of wholesale grocer G.E. Bursley and Co., where he had worked before the war.
In 1957, Bursley merged with Bluffton Grocery Co. and changed its name to Food Marketing. In 1958, McKay became Food Marketing’s president.
When Supervalu bought Food Marketing in 1963, McKay was named the retail chain’s executive vice president of operations. He was promoted to president and CEO in 1970, and served as vice-chairman of the board from 1973 to 1979.
After retiring from Supervalu, McKay and Don Murphy opened the first Cub supermarket in Indianapolis in 1980. They went on to own two more Cub stores in Indianapolis and two in Toledo, two County Markets in Terre Haute, Ind., and seven Save a Lot grocery stores.
For 20 years, McKay served on the board of directors of the National American Wholesale Grocery Association, including two terms as chairman and president.
McKay is survived by three sons, Rusty, Tad and George Jr.; two step-daughters, Jean and Susan; 12 grandchildren; and 13 great-grandchildren.