Specifically looking for Missouri Mortality Schedules from 1890 or 1900. Death year of the person I am researching is 1894.
Unfortunately they only had mortality schedules taken with the census from 1850 to 1880. There are no others.
I just did a quick INTERNET search ...
Unfortunately, nothing specific for, that time period; or, "Missouri" ...
From the 'FamilySearch'
United States Census Mortality Schedules
[ As an aside ... ]
United States Census (Mortality Schedule), 1850 - FamilySearch Historical Records
U.S. Census Mortality Schedule, 1860
United States census (mortality schedule) : COLLECTION RECORD, 1850
Mortality schedules of the United States census, 1850 - 1880 (New York State)
https://www.familysearch.org/search/catalog/303332?availability=Family History Library
United States Census (Mortality Schedule), 1850
Then some ...
Using the U.S. Federal Census Mortality Schedules
U.S. Census Bureau
Death Indexes (.com)
US Census Records Mortality Schedules 1850-1880
Finding Deceased People in Nonpopulation Census Records
United States » U.S. Census » Mortality Schedules » Online Records and Indexes
The U.S. National Archives and Records Administration
Nonpopulation Census Records
As an aside ...
I am "Tagging" this (General) 'Question' of yours in this "Community.FamilySearch" Forum, in some specific 'Groups' in the Forum being:
(1) "Missouri"; and,
(2) "Midwest"; and,
(3) "United States Genealogy Research"
in the hope that, the members of those groups may be able to answer/assist you.
Those Groups are "Public", which you can join, if you wish.
@United States Genealogy Research
is there any proof that mortality schedules even exist for 1890-1900??