Walter was born at Inverell in 1892 to Joseph and Emily Kellett. He was a 23 year old Labourer when he enlisted at Moree on 12 January 1916 and joined with the First Contingent of The Kurrajongs on their way to the Narrabri and Armidale camps.
He became a member of the 33rd Battalion, C Company which sailed from Australia on HMAT A74 Marathon in May 1916. After arrival in England further training was undertaken at Salisbury Plain until September when Walter was transferred to the 3nd Battalion and sent to France.
Within weeks he became ill and was returned to England to recover. It was not until August 1917 that he went back to France where he was wounded in October and invalided back to England with a gunshot wound to his arm and neck. Seven months later he rejoined his unit in France where he remained until March 1919.
Walter, who married Lillian Groom in England in April 1919, returned to Australia in July and for many years lived at Tamworth NSW where he died in 1968.