Surname of Family Tree: Green

PARENTS:
Amanda Jane Garten married John William Walker.

8 CHILDREN:
Ira, Paulina, David (John), Linton, Sanford, Morton, Teresa (Amanda) and Ella.

NEED HELP WITH THEIR SON DAVID (JOHN) WALKER
1854 to ? ... Indiana

FAMILY MOVED:
Frankford, Mower, Minnesota between 1854 and 1857. I know he was still in Frankford in 1870. I can not find anything at all after that.

Does anyone have input on this individual?

Thanks