Here are links to the death certificates:
Death certificates for Missouri death certificates 1910-1963 can be found at http://www.sos.mo.gov/archives/resources/deathcertificates/#...
You'll love searching this site
You may also want to search the St. Louis Genealogical Society site: www.stlgs.org
just enter the last name in the search box. There are some sections reserved for members only, but you can always write to me at email@example.com
and I can look up one item per request.
Catholic burials can be found on the Archdiocesan website: http://archstl.org/app/cemeteries/burial_search
The St. Louis City death records 1850-1902 are also on Ancestry.com
St. Louis City directories can be found on fold3.com and Ancestry.com