In case it's helpful to your research mystery, there are about 50 Piehl / Pihl entries indexed in the collection: "Milwaukee's German Newspapers; an index of death notices and related items", covering 1844-1950. You can use the index at the Salzmann Library in St. Francis (Milwaukee Co.). But look-ups from the index are freely available via email. Like many valuable research resources, the index is not online.
Other surnames referenced with Piehl/Pihl in Milwaukee are: Ruehl Giese Zabel Puhls Hesse Jens Kressin Kuenn Ninabuck-Helling Nitsche