Are you expecting an obituary in addition to the death notice? (Sometimes researchers have one and are looking for evidence of the other.)
Native Milwaukeeans know instinctively to look in the Milwaukee Sentinel (AM) AND the Milwaukee Journal (PM) for death notices - if it ain't in one, it's in the other, if it's not in either, that's a scandal (leaving the family vulnerable to rumor and conjecture since death notices are paid for by the family, usually as funeral expense. Word count determine$ biographical detail.). The papers were not the same paper or company for most of their years in publication.
Both the Journal and Sentinel archives have been online now for 5-6 years through Google Historic Newspapers site (they did the work), or the parallel collection called Milwaukee Journal Sentinel Archive. Use a date search for death notices, the drop down box changes to show the different sections of the archive.
John Von Haden has indexed quite a bit, but does not "transcribe" the newspapers. We have sat side by side at microfilm machines in the library and shared stories from our indexing experiences.
There wasn't any notice in the German newspapers for Anna Maria Kassel d. 1937 (or her parents). However I have indexed about 600 items from the local German papers in 1937. I've indexed about 90 combined entries or references to the surname Kassel / Cassel.
"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.