Born in Yerevan. He studied at the 26 Commissioner’s School. From 1949 to 1954 he studied at the Karl Marx Institute of Polytechnic in the Faculty of Mechanical Engineering. In 1955 he admitted to the ranks of the ICRC, from 1959 to 1961 he studied at the Higher Party School of the Central Committee of the CPSU. In 1966 he was the Secretary of Yerevan Party Committee. In 1972 he was elected secretary of the Communist Party Central Committee and member of the Bureau. From 1974 to 1988 he was the first Secretary of the Communist Party of Armenia and in 1999 he was the President of the National Assembly. Demirchyan was awarded with two Orders of Lenin, three Orders of the Red Banner of Labour and one Order of the October Revolution Awards. He also received union and government awards from other countries. He died in Yerevan.

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