According to the records he was removed to Richmond, Virginia where he died. I do not find him on the list of burials in the Federal cemetery there.
Perhaps an unknown. http://www.interment.net/data/us/va/henrico/richnat/index.htm

His service record file, which may be procured through the service noted in the Red enclosed box above, may provide the details of his death.

Willard L. Crosier

Residence was not listed; 22 years old.
Enlisted on 8/13/1862 at Macomb, NY as a Private.
On 9/29/1862 he mustered into "A" Co. NY 142nd Infantry
He died wounds POW on 6/3/1864 at Richmond, VA
He was listed as:
* POW 5/16/1864 Drewry's Bluff, VA
* Wounded 5/16/1864 Drewry's Bluff, VA
Sources used by Historical Data Systems, Inc.:
- New York: Report of the Adjutant-General