James Roxborough could be buried in either Aghadowey Presbyterian (no burial records) or St. Guaire's Church of Ireland (they do have a burial register but sometimes didn't include Presbyterians).
Didn't have a death date (after birth of daughter Lizzie 1880) for James Roxborough but since wife Elizabeth and some of the children (including Dick) were in Scotland in 1891 thought James might have died there. Found this possibility-
James Roxburgh, labourer, Belville Street, missing since March 1887, body found off Customhouse Quay on 13th April 1887 (Greenock Telegraph 13.4.1887)
Then went to ScotlandsPeople and by doing free searches narrowed down his age to 48 (so born c1839). Had a few credits left so took a look at his death certificate and it's certain the right man!
James Roxburgh, labourer (married to Elizabeth Kellacher), 'went missing 19th March, dead body found 13th April 1887 usual residence 1 Belville Street Greenock,' age 48, parents- William Roxburgh labourer (deceased) & Mary Roxburgh M.[aiden]S.[urname] Torrens, informant Annie Archibold friend, registered 15 Apr.1887.