Note: I am unsure if Walter Elmer Burris was related to any of the Pope County Burrises, but the fact that his wife and some of his children were buried in Pope County makes me think he probably was.
I found several family trees on the internet that say that Walter Elmer Burris was born about 1875 in Indiana to Martin Monroe and Mary Belle (Burgin) Burris, and died date unknown in Spiro, Le Flore Co., OK.
The same family trees list the couple's children as:
Silvester Russell Burris, born 1899 Pearl Laverne Burris, born 1904 Elizabeth Burris 1907 – 1957 Addaline Carrie Burris 1909 – 1996 Alberta Burris 1910 – 1996 John Wesley Burris 1918 – 1982
I have been unable to locate a documented grave for Walter Elmer Burris.