This looks like a terrible situation and I would like to know more about it if anyone has any clues. Agnes Maud was a g.g. aunt.
The details:

Groom's Name: Fredrich W Wallraff
Groom's Birthplace: Black Earth Wisc
Bride's Name: Agnes Maud Wallraff
Bride's Birthplace: Milwaukee
Marriage Date: 10 Jun 1905
Marriage Place: Greenfield, Milwaukee, Wisconsin
Groom's Father's Name: Henry Wallraff
Groom's Mother's Name: Anna Marie Schmidt
Bride's Father's Name: Joseph Graham
Bride's Mother's Name: Amelia Keene

And then:
Name: Maud Wallruff
Gender: Female
Burial Place: Calvary
Death Date: 17 Jun 1905
Death Place: Milwaukee, Milwaukee, Wisconsin
Age: 26
Birth Date: 26 Nov 1878
Birthplace: Mil
Occupation: Housewife
Race: White
Father's Name: Joseph Graham
Father's Birthplace: Ireland
Mother's Name: Amelia Keehan
Mother's Birthplace: Ireland

Furthermore: There was a daughter Stella, born c. 1900, but it’s unclear whether she was Maud’s daughter or not. She next appears in 1910, age 10, living with her father’s sister in Chicago. It looks like Fred married again and went to live in California.