I looked in the on-line death index before 1910 but didn't find either one. However, death certificates weren't required until 1910, therefore, early death records are sketchy.
The Northwest Missouri Genealogical Society, http://nwmogenealogy.com/
covers DeKalb and several other counties and might have info about them. They have the DeKalb County Cemetery Census 1845-1971 and death notices from area newspapers 1868-1903 and DeKalb county Will Index 1877-1898. Successful Searching!