This past week I learned from Jeff Smith whose wife is a Krigbaum descendant, the Missouri Death Certificates were online. I searched google and found the Missouri Death Index 1910 - 1957. If you go to the following website, type KRIGBAUM for the surname. There are 37 Krigbaum's who died in Missouri from 1910 - 1957.
I checked the LDS Website, and so far they do not have Missouri Death Certificates online, but you might find another state which has your ancestors death certificates. Familysearch.org below has six Krigbaum death certificates online.