"Dr. Thomas SIMPSON, Moira- a surgeon who died of cholera 299 [29th?] Dec
1832 aged 34; buried Moira Non Subscribing Presbyterian graveyard"
https://www.rosdavies.com/SURNAMES/S/Simpson.htmDate of death fits with his death announcements in many Irish papers-
Newry Telegraph, 11 Jan.1833: Of Cholera, the 29th ult., Thomas Simpson, Esq., of Moira, Surgeon.
Northern Whig, 7 Jan.1833: Of Cholera, on Saturday, the 89th ult., Thomas Simpson, Esq, Moira, Surgeon. He was universally esteemed for unbending integrity, unlimited benevolence, and a sense of the nicest honour. His religion was free from all intolerance and bigotry; his goodness of heart displayed itself in ...An Anne Simpson, age 60, died 16 Jan.1864 in Lurgan registration district (image not yet online but can be viewed on GRONI's for a few credits after registering). This may, or may not, be Thomas' widow.