He was the son of the late Adam and Hannah Marshall.
Morpeth Herald 05/04/1918 carries a brief obituary:
ROLL OF HONOUR
MARSHALL.- Missing since June 16th, 1917, now presumed killed on that date, Private John Lindsay Marshall, beloved husband of Mary Marshall, 102 Newgate Street, Morpeth.
He is remembered at Morpeth as Marshall, L. on M17.01M17.09 and M17.29, as Marshall, J.L. on M17.11 and as Marshall, John on M17.21