Miss Mary Mullin was born in Clarinbridge, Co Galway, Ireland on 31 August 1893.
Hailing from a Roman Catholic family, she was the daughter of Redmond Mullin (b. circa 1864) and Delia Hynes (b. 1871) who had married in 1885.
She had five known siblings: Owen (b. 1889), Bartholomew (b. 1890), Dan (b. 1891), Bridget (b. 1892) and Margaret (b. 1893). Her parents ran a public house and shop in their village and they were a financially comfortable family for the time in Ireland. Her father died on 17 September 1893 and left an estate valued at £10, 690, 16s, 1d.
Mary appears on the 1901 census as a seven-year-old living with her mother and siblings and a host of servants at house #4, Hillpark, Clarinbridge. By the time of the following census she was a pupil at a boarding school, Loretto Convent, in Rathfarnham, south Dublin. Her family were then listed at house #3 in Clarinbridge.
By 1912 Mary's family had an assistant in their shop, a 20-year-old Longford native named Denis Lennon. The two fell in love and made plans to leave Ireland and cross the Atlantic. They boarded the Titanic at Queenstown as third class passengers (ticket number 370371 which cost £15, 10s) and were using the names Dennis and Mary Lennon.
Mary's brother Joe (and possibly also her mother) reportedly pursued the couple all the way to Queenstown, Joe carrying a loaded firearm in his fury, but they reached the dock too late.
Mary Mullin, along with Denis Lennon, died in the sinking. Their bodies, if recovered, were never identified.