If the note about the first name of James Fitzpatrick's wife is correct, she may be the Margaret Herlehy who married a James Fitzpatrick in D. C. on June 1, 1836. According to the 1850 census, James Fitzpatrick was indeed a "bank runner" or messenger, however the information contained in Honora Whelan's death record about her being born in Ireland cannot be correct; the 1850 and 1880 census records clearly show that she and her siblings were all born in the District of Columbia.
Here's a copy of Honora Whelan's obituary as it appeared in the Evening Star on January 8, 1896, page 7.