"... Charles F./Karl EICHHOLZ and his wife Catharina SCHMIDT. He was Prussian-born; she probably in the Watertown area. As of the 1880 Census, they lived on 10th ST in Milwaukee ..."
For anyone returning to this thread, German-American research in Milwaukee is a whole lot easier since I created the resource "Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950).
Have you determined where or when your Karl Eichholz died? There are possible matches for your Eichholz family in the index - about 50 occurrences indexed so far. Some of the other surnames I've referenced with Eichholz include Schmid Buenger Maas Gill Janke Mosgrove Pagel Wegner Block. Be sure to widen your search to include Eichholtz
For more specific information contact:
Gary Rebholz, compiler/editor
Indexing Milwaukee's German newspapers continuously since 2007... helping to access our historic German-American culture.