More press cuttings on this link
1896 Jan 19. John Gaynor was born in Newtownards, Co. Down. His father served for 25 years in the British Army (from news reports)
1901 Census. Living at 41 James Street ,Newtownards,, Down)
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1911 census Living at 68 Hawthorne Street, Falls, Belfast
1918 . John Gaynor was an active republican, having joined ‘B’ Company, 1st Battalion, Belfast Brigade in 1918 and remaining a member up to the time of his death.
1920 Sep 26. Shot in his home. He lived with his parents, and was a plumber
One Witness statement points to John Gaynor being an IRA Volunteer. His brother Liam wsa more active in the IRA, but was not at home that night
And this is conformed in a second Witness statement
A Militay Funeral
1920 Nov 4. Questions were asked in Westminster, without much clarification (see Hansard)
Mr. DEVLIN asked the Chief Secretary for Ireland whether three men—namely, John Gaynor, Springfield Road, Belfast; John M'Fadden, Springfield Road, Belfast; and Edward Trodden, Falls Road, Belfast—were murdered by uniformed men; whether any inquest was held in these cases; and whether any of the assassins were brought to justice, or what the Government propose to do in the matter?
§ Sir H. GREENWOOD A military court of inquiry was held in each of these cases. In the case of John Gaynor the court found that he was killed while resisting arrest by members of the police force, who fired justifiably in the execution of their duty. The finding in the cases of John M'Fadden and Edward Trodden was that death resulted from bullet wounds inflicted by persons unknown.
...... and later in the debatean extraordinary outburst from Thompson Donald, MP for Belfast Victoria
Mr. DONALD Is the right hon. Gentleman aware that, if any more policemen or soldiers are murdered in Belfast, there will be more than three Sinn Feiners shot?
§ Mr. DEVLIN You would not have the courage to shoot anybody!