Rifleman John Connor was born in Castledawson, Londonderry, Ireland, in 1848 to Mary and Thomas Connor.
In June 1866 he was a volunteer in Number 1 Company, The Queen’s Own Rifles called up to active service to fight the Fenian invaders at Fort Erie.
Surviving the battle, he died less than a year later, on 17 February 1867, of illness attributable to his time of service. Many of the volunteers took to drinking water from ditches and streams due to a lack of supplies which quite likely resulted in a number of deaths after the battle.
He was buried by his mother and members of his Company in the Necropolis Cemetery Toronto Plot H-229a.
His grave marker is only partially readable and also included some other family members (text courtesy of Necropolis Cemetery) :
Gone but not forgotten
Erected by Mary CONNOR
In memory of her beloved son
Native of Castledawson,
Died Feb. 17, 1867
[from] disease contracted at [Ridgeway]
June 2, 1866
[In] the 19th year of his life
Not only has our house been […..]
[……] death has called him […..]
[…….] truth with fond embrace
[……..] whom we loved so dear
Faithful friend a son most dear
A [tender] brother lieth here
Great is the loss that we sustain
But hope in Heaven to meet again
Native of Castledawson
Co. Londonderry Ireland
[died] [Jan or Jun] 10, 
[several lines illegible]
The beloved wife of
Died [Nov.] 24 1879
As of 2022, thanks to efforts by the regiment, a new grave marker was installed for Rifleman John Connor.