married Celesta Marshall.

In April, 1911, Walter enters the United States with the purpose of buying a fruit farm.  According to the document, he was in the United States previously for 3  years.

This set of documents confirms the ones above.

Walter again enters the United States November 1913.  According to this document, he had never been to the United States and his eye color is now blue and German nationality instead of Dutch.  Apparently, immigration security was fairly lax back then.

A Walter Corman is listed as a Voter in both 1957 and 1963.  It is not known if this is the same Walter as ours.  If it is, then if gives more of a clue to when Walter died.

There is a stone for Walter in Stoney Creek Cemetery
Stoney Creek, Hamilton Municipality, Ontario, Canada.
As there is not final death inscription on the stone, it is not known if Walter is actually buried here.