The 1855 New York State census, dated July 3, 1855, indicates Mary and Daniel had a son named Edward H. aged eleven months old living with them. That would put Edward's birth about August 1854.
finagrave has death date as Feb. 7, 1868; Paris, France records have Feb. 8, 1869; Bodies in Transit to NY, NY has Feb. 11, 1868 with burial in Greenwood, presumably Green-Wood Cemetery in Brooklyn but there is a stone in Old Bennington Cemetery.