I found this reference to Ann Pitcher on the internet a couple of years ago.Unfortunatelyl, I didn't write down the site at which I found it.
"At Sandy Hill, suddenly Mrs. Ann B. Pitcher, consort of the Hon. Nathaniel Pitcher, age 33 [birth calculated 1797], lately of Dutchess County."This was in the Washington County Post, a newspaper, in the 12 May 1824 issue.
If you have any additional information on his mother or children, I would be grateful.