The 1870 census lists one John Marshall, an instructor at the Morning Sun Academy in the Ohio town of the same name. At the time of that census, Marshall was 32 and married. From what I’ve been able to dig up, the Morning Sun Academy was open from the 1850s to the 1870s. I don’t know what caused John Marshall’s demise, but it appears he was well-loved enough that people who knew him as a teacher helped pay for his monument in the cemetery.
A Grave Concern 