Sean McKenna was the son of Terence and Sarah Jane McKenna. He was born about 1926. Sean lived with his parents at 64 Regent Street, Belfast. He had left school and was working as a shop assistant. During World War Two, Sean became a messenger for the Air Raid Precautions in Belfast. On 16th April 1941, Easter Tuesday, Sean McKenna was at ARP Post 396 at Unity Street when a parachute mine struck the spire of Trinity Street Church. Seven members of ARP Post 396 were crushed by falling masonry, including Sean McKenna, who was just fifteen years old.