William Middleton Miller was born on 30 August 1883 in Whitehouse, a civil parish just north of Belfast in Co Antrim, Ireland. He was the son of James Miller, a fireman, and Jane Brown and hailed from a Church of Ireland family. 

Described as a fireman, Miller was married in Belfast’s Church of St James on 30 July 1909 to Isabella Wilson (b. circa 1885). In March 1910 their first child arrived, George, and he would be followed by James in April 1911 and William in November 1914. The family appears on the 1911 census residing at 37 Kilbronan Street in north Belfast and Miller was described as an ironworks labourer. 

Miller’s ship prior to Titanic had been the Saxon. He joined Titanic at Belfast for the delivery trip to Southampton where he then disembarked.

William Miller remained at sea until at least the early 1920s but what became of him thereafter is uncertain.