You can request the obituary and burial permit from the St Louis Public Library at this webpage: http://www.slpl.org/slpl/gateways/article240117800.asp
. Once you have the details you can request the obit using the website's "Ask A Librarian", email option. The library used to mail the obits, but I think they now will email it to you.
Also, you may be interest in viewing the Patrick Wallace death certificate at this webpage: http://www.sos.mo.gov/archives/resources/deathcertificates/
David in Pennsylvania