Besides the excellent card file index of the English language newspapers (1880-1890s?) in the public library in Milwaukee, there's a new index being constructed from the German language newspapers called: "Milwaukee's German Newspapers; an index of death notices and related items" covering 1844-1950.
The names Klingbiel and Klingbeil (?), as well as Stelter are represented in the 350,000 entries collected since 2007 and still growing in 2012.
Specific look-ups available from the most current data:firstname.lastname@example.org