According to Mary Adelia's great great niece, Jean Slinghuff: "Aunt Delia (as my Mother called her) was the one killed in an accident when the bridge they were crossing broke. My grandparents were with them huckleberry picking."
Jean -> her mother,Alta and Uncle Paul Ward -> her grandparents were Willis and Leona Ward. Willis was the brother to Nellie, Nora, Frank, and Mary Adelia Ward. --from an email, February 2009
This information was not included at the time of publishing of the Windemuth Family Heritage.
