Adolph Pflueger Blew His Brains Out IN a Patch of Corn

That was a sad ending for an interesting life. Adolph emigrated from Einbeck, Niedersachsen, Germany. He was born 06 MAY 1843 and rejected the radical political life, choosing to become an immigrant 15 Feb. 1867, settling in Cincinnati, Ohio, USA, then moving his family to Madison county, Indiana, USA.

I would appreciate suggestions for finding his German parents.