Born 1928, Walter was the second premier of Antigua and Barbuda, the founder of the Antigua Workers' Union (AWU) and the Progressive Labour Movement (PLM) and a former general-secretary of the Antigua Trades & Labour Union (AT&LU).
Walter won Premiership in the 1971 elections, defeating Vere Bird four years after the colony became a British dependency with domestic autonomy. He advocated full independence for Antigua and Barbuda and opposed a British proposal to make Antigua and Barbuda an island federation. He was defeated in the 1976 elections by Bird.
The PLM headed the government from 1971 to 1976. During his tenure as premier of Antigua and Barbuda, Walter was the representative of All Saints, which was then one constituency.
In all, he had 10 years in government – five as premier and the other five as leader of the opposition.
The Social Security Act, the Labour Code that was copied in every Caribbean territory, the Representation of the People's Act and the founding of the Antigua & Barbuda Development Bank were all the work of his PLM government.