There were 12 people with the last name of Wilkewitz who died in Michigan in the late 1800's/early 1900's. Their death certificates are all available online at http://seekingmichigan.org/ - type "Wilkewitz" (no quotes) in the search field of the red box that says "Seek: Start with a Search," and you'll find death certificates for the following people:

Emma Wilkewitz
Died Feb 27, 1917 in Detroit, Wayne County, MI

Ernstine Wilkewitz
Died Apr 20, 1905 in Springwells, Wayne County, MI

August Wilkewitz
Died Apr 19, 1916 in River Rouge, Wayne County, MI

Fred Wilkewitz
Died Apr 27, 1902 in Springwells, Wayne County, MI

Augusta Wilkewitz
Died Aug 23, 1902 in Springwells, Wayne County, MI

Auguste Walnofske (nee Wilkewitz)
Died Nov 26, 1915 in Detroit, Wayne County, MI

Arthur E Wilkewitz
Died Sep 28, 1899 in Detroit, Wayne County, MI

William Wilkewitz
Died Jan 29, 1900 in Springwells, Wayne County, MI

Irene Wilkewitz
Died Dec 27, 1916 in Detroit, Wayne County, MI

Evelyn Wilkewitz
Died Dec 29, 1916 in Detroit, Wayne County, MI

William Wilkowitcz
Died Feb 17, 1915 in Detroit, Wayne County, MI

Bernier Wilkewitz
Died Aug 4, 1920 in River Rouge, Wayne County, MI