was born on 29th April 1891 to James Walker and Annie Mary Walker nee Stewart of Ballyrock.
In 1901 Samuel is living in house 1, Ballyrock Scotch, Beardiville, Co. Antrim with his grandparents David & Martha Walker, his parents and 5 siblings, Ida, Karolina, Marion, Francis and Robert.
By 1911 the property is recorded as house 5, Ballyrock Scotch, Beardiville, Co. Antrim.
In 1911, Walker is boarding in house 1.2 Castlewood Avenue, Rathmines & Rathgar East, Co. Dublin. He is described as a Bank Clerk. There are a further 2 possible colleagues boarding; Samuel H Eakin (22) and Archibald A Ennes (20), both described as Bank Clerks.
Walker enlisted as a Private into the Royal Highlanders with Service Number 2178. His first theatre of war is recorded as the Western Front from 2nd May 1915.
Following his promotion to 2nd Lieutenant he was transferred to the 12th Battalion Royal Inniskilling Fusiliers and later promoted to Lieutenant.
The Belfast Banking Company 'Roll of Honour' booklet records Walker as having been 'previously wounded' with his last known address 'Palestine'.
He was awarded the 1915 Star, British War Medal and the Victory Medal.