Mr Martin McMahon was born in Ennis, Co Clare, Ireland in 1893.
He was the son of Anthony McMahon (b. 1838), a farmer, and Honor Meaney (b. 1851), Clare natives who had married in 1871 and who welcomed their first child of fourteen on Christmas Day that year, John. Out of their fourteen total children only seven survived infancy. Their known children, besides Martin, were: John (b. 1871), Maria (b. 1873), Bridget (b. 1875), Patrick (b. 1879), Michael (b. 1886), Edmond (b. 1890) and Margaret (b. 1896). They were a Roman Catholic family who were fluent in both Irish and English.
He appears on the 1901 census living with his family at 10 Cragbrien, Lisheen, Co Clare but he would be absent from the family home, 14 Cragbrien, Lisheen, by the time of the 1911 census. He was listed elsewhere as an unmarried farm servant living at 1 Cloonmore, Lisheen, the home of a Bridget Hurley and her adult son Thomas.
He boarded the Titanic at Queenstown on 11 April 1912 (ticket number 370372 which cost him £7, 15s). His destination was 415 West 53rd Street, Manhattan.
Martin McMahon died in the sinking and his body, if recovered, was never identified. Local media at the time related that he was a well-known and well-liked young man who exhibited promising athletic abilities.