Sorry that I don't have alot of time for genealogy right now but here's some things that look to be helpful for you if this is the same marriage :
Baptism at St Mary's 22 Apr 1880
Patrick Stuart, son of Robert Stuart and Susan Murray of Aughtercloney, witnesses William Marron and Mrs Marron.
By the way, the parish priest at the time was Alexander Stuart.
Then, from gravestone inscriptions from St Marys
IHS Erected by Margaret Marron, Aughtercloney, in memory of her husband William Marron who died 28th October 1923, aged 86 years. Also her niece Margaret Stewart died 10th January 1918. And her nephew Patrick Stewart died 15th October 1916. And above named Margaret Stewart died 4th October 1928
Jeez, 3 out of 4 died in October. You'd best lay low when the leaves fall.
hope this helps,