Their marriage records online for Lucas, OH are alpha listing by last name. Neither shows participants other than the spouses and official. You can find them online.
Ohio Marriages
Name: Harry Walker
Marriage: 01 Oct 1874 Lucas, OH
Spouse: Emma M. Dewolf
Citing this Record: "Ohio, County Marriages, 1789-1997," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X84X-TQD), Harry Walker and Emma M. Dewolf, 01 Oct 1874; citing Lucas, Ohio, United States, reference Vol. 2 p. 146 # 300; FHL microfilm 912940.
Reference ID: Vol. 2 p. 146 # 300
IMAGE SOURCE: https://familysearch.org/pal:/MM9.3.1/TH-1-18084-159854-57?cc=1614804
Citing this Record: "Ohio, County Marriages, 1789-1997," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X83X-3LH), Harry Walker and Emma M. Dewolf, 01 Oct 1874; citing Lucas, Ohio, United States, reference Vol.2 p.727; FHL microfilm 912940.
Reference ID: Vol.2 p.727
IMAGE SOURCE: https://familysearch.org/pal:/MM9.3.1/TH-1-18084-158645-80?cc=1614804
Did she remarry?
https://familysearch.org/pal:/MM9.1.1/F6N5-GRJ
Emma Maria Dewolf Paige
Ohio, County Death Records, 1840-2001
birth: 1851 Unknown
death: 27 November 1929 Rochester, Monroe, NY
burial: Toledo, Ohio
residence: Unknown
father: Unknown
mother: Unknown