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.

Surrey Advertiser 5 June 1952  He was called to the bar in 1929. He practiced on the Munster Circuit till February 1934 when he joined the Colonial Legal Service. During his first tour he acted as Solicitor General in Kenya and took an active part in the Legislative Council. He was appointed Crown Council in Kuala Lumpur in 1939 and was partly responsible for the organization of civil defence in Singapore. He was interned throughout the Japanese occupation and suffered much privation in Changi jail. In 1947 he was appointed Attorney General for North Borne, which office he held until he was appointed Attorney General for Tangamika about six weeks ago. He played water polo for Cambridge University in 1925 and 1926. In 1947 he married Margaret, daughter of the Rev Tom Pearson, Vicar of Slapton S Devon. She survives him with a son and one daughter.