Gilby, thank you for this bit of information. It seems as though he would be the same person as he also had a son, Robert, named after his father no doubt. It will be of interest to find out his wife, Helena's, maiden name.
From Hibernia Magazine abstract:
c. 1774--Coleraine, death of Mrs. Helena Stewart, relict of the late James Stewart of Coleraine.
As these Stewarts lived in the Coleraine, Londonderry area, I wonder if the the following Stewarts
would then somehow be related:
Burke Landed Gentry--Walsh of Laragh
1.Rev. William Walsh, b. 1710; m. 1736 to Mary, dau of Robert Stewart of Coleraine, and sister of
the Rev. Richard Stewart, Dean of Leighlin.
2.Rebecca Walsh m. 1779 Capt. Thomas Ussher.