Buddharakkitha played an important role in bringing S.W.R.D. Bandaranaike to power in 1956 parliamentary elections. He was the driving force behind the Eksath Bhikku Peramuna or the United Bhikku Front. He has been described as a virtual kingmaker at that time. Later, he attributed Bandaranaike's failure to aggressively pursue the nationalist reforms as the sole motive to assassinate him. But it was revealed that the real motive for the assassination came as a result of the Prime Minister's refusal to award business deals, in particular, a government contract for the construction of a sugar factory and government concessions for a shipping company he planned to set up. Talduwe Somarama, another Buddhist monk killed Bandaranaike on September 25, 1959, under the direction of Buddharakkitha.
Buddharakkitha's various notorious acts only surfaced after he was convicted. He was described as a rich businessman who was involved in various high profile businesses. Buddharakkitha routinely consumed whisky, which was an offense for a buddhist monk. He allegedly had a sexual relationship with Wimala Wijewardene MP, Minister of Health and the only woman member of the Bandaranaike's Cabinet in 1959. Wimala Wijewardene was the sister-in-law of D. R. Wijewardena and the widow of Don Charles Wijewardene, author of The Revolt in the Temple. She was also an aunt of Ranil Wickremasinghe, the current Prime Minister in the Sri Lankan parliament.
Surprisingly though, the first person to express his anger and sadness over the Radio Ceylon (the only radio broadcasting service at the time) on the attempt to kill the Prime Minister was Mapitigama Buddharakkitha. The Sri Lankan Government called Scotland Yard to undertake extensive investigations of the incident. Investigations revealed that Buddharakkitha was the mastermind behind the assassination. Subsequent court case sentenced him to death in 1961. The sentence was later changed to one of life imprisonment. He died in 1967 by heart attack following 6 years of hard labour.
- A.C. Alles, Famous Criminal Cases of Sri Lanka, Volume III: The Assassination of Prime Minister SWRD Bandaranaike (Dec-1979): Published by the author. Hardcover published by Vantage, Inc., N.Y., U.S.A. 1986 as The Assassination of a Prime Minister. ISBN 0-533-06636-0.
- Lucian G. Weeramantry, The Assassination of a Prime Minister - The Bandaranaike Murder Case (Hardcover, Geneva, Switzerland, 1969).
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- Weeramantry, L.G: Assassination of a Prime Minister – The Bandaranaike Murder Case, Geneva, 1969.
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