There are detailed articles in Milwaukee's German papers from March 3 to March 6, 1878 concerning a Mr. "Scheffler" later tentatively id'd as Mr. David Scheffner (he'd been in the lake for about 4 weeks and difficult to identify, but missed by his family in Mequon for about that long). Names listed in the inquest transcript, along with their testimony, are David and Caroline (Scheffner) Grünewald, their sons Wm. & Frank Grünewald, and various neighbors and other acquaintances of David Scheffner. The name is first reported as "Scheffler".
There are likely articles in the 1878 English language papers, and the original transcript may be in the collection of the Milwaukee County Historical Society.
"Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950).
Gary Rebholz, compiler/editor
Indexing Milwaukee's German newspapers continuously since 2007... helping to access our historic German-American culture, not data.