Background: John Anthony Burgess Wilson,  (25 February 1917 - 22 November 1993) - who published under the pen name Anthony Burgess - was an English writer and composer. From relatively modest beginnings in a Catholic family in Manchester, he eventually became one of the best known English literary figures of the latter half of the twentieth century. Although Burgess was predominantly a comic writer, his dystopian satire A Clockwork Orange remains his best known novel. In 1971 it was adapted into a highly controversial film by Stanley Kubrick, which Burgess said was chiefly responsible for the popularity of the book.
Context: In 1954, Burgess joined the British Colonial Service as a teacher and education officer in Malaya, initially stationed at Kuala Kangsar in Perak, in what were then known as the Federated Malay States. Here he taught at the Malay College (now Malay College Kuala Kangsar - MCKK), modeled on English public school lines. In addition to his teaching duties, he was a housemaster in charge of students of the preparatory school, who were housed at a Victorian mansion known as "King's Pavilion". A variety of the music he wrote there was influenced by the country, notably Sinfoni Melayu for orchestra and brass band, which included cries of Merdeka (independence) from the audience. No score, however, is extant.  Burgess and his wife had occupied a noisy apartment where privacy was minimal, and this caused resentment. Following a dispute with the Malay College's principal about this, Burgess was reposted to the Malay Teachers' Training College at Kota Bharu, Kelantan. Burgess attained fluency in Malay, spoken and written, achieving distinction in the examinations in the language set by the Colonial Office. He was rewarded with a salary increase for his proficiency in the language.  He devoted some of his free time in Malaya to creative writing "as a sort of gentlemanly hobby, because I knew there wasn't any money in it," and published his first novels: Time for a Tiger, The Enemy in the Blanket and Beds in the East. These became known as The Malayan Trilogy and were later published in one volume as The Long Day Wanes.
Question: What was the cause of his death?

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