Sean Hayes was a son of Denis Hayes and Mary Donovan.
Julia Crowley was a daughter of Timothy Crowley, business Clerk.

John Hayes, bachelor, Insurance Official, of Sullivan's Quay, Cork and Julia Crowley, spinster, of Friar's Walk, Cork married on 26 June 1922 at the Catholic Church Ballincollig, Co. Cork.

Death of Sean Hayes:

From death certificate: Sean Hayes died on the 24th January 1928 at 28 Seafield Road, Clontarf. He was 42 years old. He was married. He was a civil servant. Cause of death was pulmonary tuberculosis (2 years) with pneumothorax (1 day). The informant was W. White of 28 Seafield Road, Clontarf

Report on death: Irish Independent Wednesday, January 25, 1928
MR. SEAN HAYES, EX-T.D.
DEATH ENDS A PATRIOTIC CAREER
The death of Mr Sean Hayes, ex-T.D., at the early age of 42 years, has come as a shock to his many friends. A native of West Cork, he entered the civil service in 1904, and after 8 years in London, he came to Dublin.
From his youth ho was interested in the Irish Ireland movement and was a member of several organisations which had for their object the achievement of Irish Independence. He was a member of the Irish Volunteers from their inception and fought in tho G.P.O., O'Connell St., in Easter Week, 1916. With hundreds of others he was deported to Frongoch, where he was camp commandant until the amnesty.
In the years that followed, he continued to take a prominent part in the independence movement and was elected T.D., for West Cork in the GeneralElection in December 1918; and in 1921 he was reelected.
VICTIM OF HUNGER STRIKE.
During these years he was several times arrested and deported, and he took part in the memorable hunger strike in Wormwood Scrubbs Prison, an experience that caused a serious breakdown in his health and may be regarded as being directly responsible .for his early death.
He took part in many of the I.R.A. activities and was a close personal friend of the late Gen., Michael Collins. On the ratification of the Treaty, he sided with the majority.
During the civil strife, he was Military Governor of Newbridge Camp, and subsequently ho was appointed to a post in the Post Office.
The late Mr Hayes was a quiet mannered and lovable character and enjoyed wide popularity amongst a large circle of friends, whose heartfelt sympathy will go out to his young wife
 

Report on the funeral: Cork Examiner Friday, January 27, 1928;
LATE MR. SEAN HAYES.
Funeral Of Former Co. Cork Deputy.
IMPRESSIVE DUBLIN TRIBUTE.
Dublin, Thursday.— Aan impressive tribute to the memory of the late Mr Sean Hayes, ex-T.D., (Gleann Álainn 28, Seafield Road, Clontarf, was paid to-day when the remains were interred in Glasnevin Cemetery, following Requiem Mass celebrated at 10 o'clock in the church of St. John the Baptist, Clontarf, by the Rev. W. Meighan, C.C.
The cortege was of imposing dimensions and included members of the Oireachtas and the army, representatives of various Government departments, in addition to many old friends who were intimately associated with the deceased in the struggle for independence.
The prayers at the graveside were recited by the Very Rev. P. O'Donovan P.P., Caheragh, Co. Cork.
The chief mourners were:—Mrs. Hayes, widow: Mr T. Crowley, father-in-law Mrs Kathleen Crowley, sister-in-law; Very Rev. P. O'Donovan, P.P., Caheragh. and Rev. D. O'Donovan, C.C, Ballincollig, uncles; Mrs O'Brien and Miss Kathleen O'Brien, and Mrs E. J. O'Kane, cousins.
Those present at the obsequies included —An Ceann Comhairle and Mrs Hayes, Mr Fionan Lynch, Minister for Fisheries; and Mr M. Heffernan, T.D., Parliamentary secretary to the Minister for Posts and Telegraphs, representing the Executive Council; Major-General Peadar Mac Mahon, representing the Department of Defence; Commandant Risteard Ua Heigeartaigh, representing the Minister for Defence; Mr S. Dolan, T.D., Parliamentary Secretary to the President; Mr J. J. Purcell, representing; Mr P. S. O'Heparty, Secretary G.P.O.; Commissioner Kevin O'Sheil, Mr Batt O'Connor, T.D., Mr and Mrs J. J. Walsh. Mr and Mrs P. J. Walsh, Mrs Arthur Griffith and Master Griffith, Mr P. S. Doyle, T.D.; Mr M. A. Corrigan, Chief State Solicitor; Mr W. P. Corrigan, Solicitor etc.

Death of Julia Hayes:

Report: Cork Examiner Saturday, September 14, 1963
WIDOW OF SEAN HAYES, T.D., DIES IN DUBLIN
The death took place in Dublin yesterday morning of Mrs Julia Hayes, 28 Seafield Road, Clontarf.
She was the widow of Sean Hayes, T.D.. for West Cork, who was prominently associated with the struggle for Irish independence.
The late Mrs Hayes had lived in Dublin for a long number of years.