What range of years are you looking at? A Robt. & Jennie Mielke published death notices for 12 yr. old Royal Friedrich Wilhelm Mielke in July 1912; a Charles Mielke (your Carl?) died in April 1929 with death notices also found in the local German newspapers. These are some of the 125 Mielke entries or references found in the local resource "Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950).
Gary Rebholz, originator/compiler/editor, Milwaukee Wis.firstname.lastname@example.org
Indexing Milwaukee's German newspapers continuously since 2007... and beyond 2013.