There were family death notices published in the local German papers for your Wm. Schnieder. There are also possible matches for his parents, George & Theresa. These are collected in the local resource "Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950).
There are currently 1,082 Schneider entries or references in the current data.
Indexing Milwaukee's German newspapers since 2007 ...