Chances are good that George died and was buried in Waterville.
This family was in the 1910 Census in Waterville, Kennebec County, Maine, ED 121, Sheet 15=A, Line 43.
McKay, George W., Head, male, white, age 28, married 7 years, born Canada, parents both born Canada, conductor, railroad.
McKay, Flora L., Wife, female, white, age 25, married 7 years, 5 children, 2 living, born Canada, parents born Canada.
McKay, Vaughn, son, male, white, age 5, born Canada, parents born Canada.
McKay, Donald, son, male, white, age 3, born Maine, parents born Canada.
Carians (Spelling?), William, border, make, white, age 25, single, born Maine, parents born Maine, Breakman, Railroad.
McKay, Margaret, sister, female, white, age 14, born Canada, parents born Canada.