Kostanski served in the United States Naval Armed Guard during World War II. While in the guard he served as a Gunners Mate Third Class on the ESSO Rochester from 1943-1946.[1][2] In 1947, Kostanski married Virginia Geraghty.[1]
After his service in the military he went to the Franklin & Marshall College and to the New England Institute of Funeral Directing Embalming. Kostanski lived in Turners Falls with his wife and family. He was a funeral director and was the owner of the Kostanski Funeral Home in Turners Falls.
^'1969-1970 Public Officials of the Commonwealth of Massachusetts.' Norma C. Pidgeon/Wallace C. Mills, Biographical Sketch of Walter Theodore Kostanski, pg. 203