Died suddenly only a few days after arriving in Tanganyika to take up his appointment as Attorney-General in Tanganyika.

Sir Marston Logan writes - "My wife and I knew Theo Wallace from the beginning of his Kenya days, and he won our instant liking and regard. He had great charm, personality, and a ready Irish wit, and he spread friendliness wherever he went. His conversation was distinctive, and he had the knack of saying shrewd things amusingly. He was selective in his friendships, but we never heard him speak unkindly of anyone. As a tennis partner he was delightful, exuberant in victory, and unruffled in defeat. When quite young in the Colonial Legal Service, he acted for some time as Solicitor-General, and gave clear indication of the intellectual and legal capacity which was later to show in responsible offices. I last saw him just before he went back to the Far East. He bore the Japanese no malice, though his sudden death may be attributable to 3 years' confinement in Changi gaol, with all the suffering entailed in that war-time experience.