Thomas Cotter was the son of William Cotter. His mother may have been Sarah Callaghan. He was born in Aughnacloy on 21st August 1885. He was one of at least eight children, five surviving, all born in the Aughnacloy area. By 1910 he was living in Belfast and working as a driller. Sapper Thomas Cotter served with the ‘M Company’ of the Royal Engineers. He died in Belfast on 29th January 1918.