Thomas B Marlin Born 1840 IN Philadelphia PA Died Between 1885 and 1888 I Have Been Looking for the Death Certificate for a Year

Fathered a child in 1885. Clara only lived 4 months April to August 1886.
His wife Mary is listed as a widow of Thomas B in the 1888 city directory.
All post 1888 documents list him as deceased.
Mary remarried in 1890-91 to Hugh O'Brien.