After her death, he married secondly Wilhelmina Forth, daughter and co-heir of Neville Forth of Newton House, County Meath.
William Ogle Moore, Dean of Clogher; and Helen Matilda, and a son, Edmond Henry Casey.
Following his death, the Dublin Evening Mail wrote of him: Mr. Casey was remarkable man, in remarkable times, and presented in every sense and acceptation of the term, a singularly favourable specimen of the Irish gentleman of the old school.
Bland and social in habit—warm and frank in manner—cordial and sincere in feeling—courteous and polished demeanour, he was once respected and beloved.
With a memory richly stored, and a mind highly cultivated, he was the attraction and the ornament of every circle in which he moved... throughout a long and varied life, Mr. Casey sustained his character for honour—independence—high-mindedness and fidelity: and was pre-eminently distinguished for kindliness of heart, gentleness of deportment, and amiability of disposition.