http://records.ancestry.com/Andrew_Jackson_Roberts_records.a...entry about Andrew Jackson Roberts death date is 29 Mar 1876
There's also an older post from a descendant of Steven Roberts, son of Andrew Jackson Roberts here:
http://boards.ancestry.com/thread.aspx?mv=flat&m=3080&am...I did find one Andrew Roberts with family in 1870 Indiana census, but seems to be a different one
United States Census, 1870-Indiana-Marshall-German
(FamilySearch Center)
https://familysearch.org/pal:/MM9.1.1/MX6S-44G