Is this another member of family?
Catherine McDermott of Bacup, father Peter, married Michael Darcy, 26th Dec. 1896 St. Mary, Bacup. Witnesses William & Mary Dunleavy. [NB a witness to marriage of Helen/Ellen McDermott to Peter Walsh reply #14 was James Darcy.] (from LANOPC)
I noted the name Dunleavy as one of my Irish families had a connection to a Dunleavy in Mayo. Also there's a Haslingden-born historian called Dunleavy. He's an expert on Michael Davitt. A Dunleavy family lived in the same Haslingden street as the Davitt family. Peter and Michael McDermott would have been contemporaries of Michael Davitt.
I noticed the surname Egan several times as godparents for children of Michael & Bridget McDermott; John & Maria Egan for Bridget 1875, John for Michael 1877, Thomas & Mary for James 1881. Selecting Rawtenstall + 7 miles radius as location parish for LANOPC 'Ancestor Search', a date +/-20 years and putting Michael McDermott in 'Other person' names boxes, found him as godfather to these children, baptised at St. James the Less, Rawtenstall:
Thomas Simon Egan, son of Thomas Egan & Mary (McDermott); baptised Nov. 1868; born 30th Oct. 1868. Godmother was Honora McDermott. (Honora could have been Honor, Nora, Oney, Hannah or Annie in everyday life, to name a few.)
Michael Hagan, son of Thomas Hagan & Mary (McDermott); baptised Nov. 1870.
Those baptisms led to a marriage at St. Mary, Rawtenstall, 27th May 1859. Thomas Hagan & Mary McDermott, both of Rawtenstall. Bride's father was Michael McDermott.
Michael McDermott was also godfather to Sarah Doyle, daughter of Andrew & Catherine (Ward), 1879. Godmother was Bridget McDermott.
19thC burial registers for Bacup and Rawtenstall cemeteries and 20thC for Haslingden cemetery are on LANOPC with cemetery plans. Several McDermott burials in each cemetery. As usual with 'Mc/Mac' surnames, the indexing is erratic. A Michael McDermott was buried at Rawtenstall cemetery on 13th March 1913. Abode 616 Burnley Rd., Crawshawbooth. Age 57; occupation labourer. Parish removed from: Rawtenstall. Crawshawbooth is a village north of Rawtenstall and Burnley Road is the main road north out of Rawtenstall.
I think there were a few early burials at St. James the Less. Prior to the building of St. James, Catholics were probably buried in C. of E. churchyard.
Some early R.C. baptisms on LANOPC at Rawtenstall Oratorio, which I assume predated the church.
Edit. Deaths register St. James the Less on LANOPC. 1855-1870; 1877-79; 1879-1979.
The Oratorio may have been at Sunnyside Mill. Earliest baptisms were before 1830 but undated.