Hello Richard,
This book "Royal Irish Constabulary Officers. A Biographical and Genealogical Guide, 1816-1922" by Jim Herlihy was not of much assistance to poor Prue yesterday. Your David Murnane is the second officer I have found in it today.
I have just posted a reply to a person person whose ancestors came from Co. Cork.
Jim Herlihy has David as being born in 1858 but the date of his death tallies with yours, i.e. 1939. David is burried in Co. Limerick at Cahirconlish Cemetery. Mary Cummins' name is not mentioned although Mr Herlihy discovered she came from Co. Limerick. David and Mary married on 8th March 1886.
James Peter Murnane, David and Mary's son, was bom in Co. Dublin on 27th June 1890. His brother Michael is mentioned as being buried alongside his father. No mention is made about his date of birth but he died on 10th October 1890 the same year his brother was born. Author, Jim Herlihy probably did not search for Micheal's birth as the book is about officers in the RIC rather than their siblings.
You may find James Peter living in Cork, possibly about 1910. He was a teacher for a few months at the Christian Schools in Charleville where he was a language teacher. I wonder if this means he was at University for a while.
J.P. and his father David both rose to the rank of District Inspector. J. P. married a Londoner, Lilly McCarroll on 26th February, 1920. He was promoted to Third DI on the 23rd March 1912. This link shows uniforms of the RIC in 1903
http://www.psni.police.uk/index/pg_police_museum/pg_the_royal_irish_constabulary/pg_ric_ranks_and_uniforms.htmJames Peter Murnane retired on a pension from the RIC on 20th May 1922. His father had retired on a pension
three years previously, 31st May 1919.
All the Best, Christopher