A tip from our friends at the Missouri History Museum:
In the Missouri State Archives' Missouri Death Certificates database, you can search for (and view digital images of) Missouri death certificates from 1910 to 1963. On the original death certificates, first names were often abbreviated (i.e., John was recorded as Jno., Charles was recorded as Chas., William was recorded as Wm.). For example, a search for last name Abend and first name William will not locate the death certificate that was entered into the database as Abend, Wm. To get around this, key in the last name only and browse through the results; or visit the Advanced Search page and key in last name Abend and first name "starts with" W.
Missouri Death Certificates, 1910-1963
Pre-1910 Birth & Death Records