question: What is the date of death of Thomas Henty's father?
context: [["Theodred II (Bishop of Elmham)", ["Theodred II was a medieval Bishop of Elmham.", "The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997."]], ["Etan Boritzer", ["Etan Boritzer( born 1950) is an American writer of children \u2019s literature who is best known for his book\" What is God?\" first published in 1989.", "His best selling\" What is?\" illustrated children's book series on character education and difficult subjects for children is a popular teaching guide for parents, teachers and child- life professionals.", "Boritzer gained national critical acclaim after\" What is God?\" was published in 1989 although the book has caused controversy from religious fundamentalists for its universalist views.", "The other current books in the\" What is?\" series include", "What is Love?,", "What is Death?,", "What is Beautiful?,", "What is Funny?,", "What is Right?,", "What is Peace?,", "What is Money?,", "What is Dreaming?,", "What is a Friend?,", "What is True?,", "What is a Family?,", "What is a Feeling?\"", "The series is now also translated into 15 languages.", "Boritzer was first published in 1963 at the age of 13 when he wrote an essay in his English class at Wade Junior High School in the Bronx, New York on the assassination of John F. Kennedy.", "His essay was included in a special anthology by New York City public school children compiled and published by the New York City Department of Education.", "Boritzer now lives in Venice, California and maintains his publishing office there also.", "He has helped numerous other authors to get published through\" How to Get Your Book Published!\" programs.", "Boritzer is also a yoga teacher who teaches regular classes locally and guest- teaches nationally.", "He is also recognized nationally as an erudite speaker on\" The Teachings of the Buddha.\""]], ["Thomas Henty (Australian politician)", ["Thomas Henty MLC( 24 August 1836 \u2013 22 September 1887), was a pastoralist and politician in the early days of Victoria, Australia."]], ["Harry Johnson (wrestler)", ["Harry Johnson( 1903- date of death unknown) was an English wrestler."]], ["Bill Smith (footballer, born 1897)", ["William Thomas Smith( born 9 April 1897, date of death unknown) was an English professional footballer."]], ["Thomas Henty", ["Thomas Henty (born Thomas John Cooper 19January 195613August 1988) was an English actor, and the son of the magician and prop comedian Tommy Cooper.", "He attended Sutton Court Primary School in Chiswick, and Latymer Upper School, Hammersmith from September 1965.", "He went on to appear alongside his father in an episode of the Thames Television variety series \"London Night Out\" in 1979, as well as in four episodes of the series \"Cooper's Half Hour\" in 1980, also for Thames.", "He also acted as occasional stage manager to his father, and was backstage when Cooper died in front of a live television audience at Her Majesty's Theatre on 15April 1984.", "In addition to his work with his father, Henty was an actor in his own right.", "His desire to make his own mark in the field was behind his decision to adopt his mother's maiden name.", "In an archive interview with the television personality Frank Bough, included in the ITV documentary \"The Unforgettable Tommy Cooper\" (2001), Henty said that he did not want people in the acting profession to know that he was Cooper's son.", "Henty made appearances in episodes of the television series \"Robin of Sherwood\" (1984) and", "\"Just Good Friends\" (1986), as well as the film \"Bellman and True\" (1987).", "His role in \"Bellman and True\" was his last.", "In 1988 Henty's marriage collapsed after seven years.", "He died on 13 August 1988, aged 32, of haemophilia, following complications caused by liver failure.", "Doctors had attempted to pump seventy pints of new blood into his body, but the blood failed to clot and after three days his mother took the decision to have his life support machine switched off, four years after his father's death.", "He left a six-year-old son."]], ["Harry Wainwright (footballer)", ["Harry Wainwright( born 1899; date of death unknown) was an English footballer."]], ["Thomas Scott (diver)", ["Thomas Scott( 1907- date of death unknown) was an English diver."]], ["Tommy Cooper", ["Thomas Frederick Cooper (19 March 1921 \u2013 15 April 1984) was a British prop comedian and magician.", "He habitually wore a red fez, and his appearance was large and lumbering, at and more than in weight.", "On 15 April 1984, Cooper died of a heart attack live on television."]], ["Albert Thompson (footballer, born 1912)", ["Albert Thompson( born 1912, date of death unknown) was a Welsh footballer."]]]
supporting_facts: [["Thomas Henty", 0], ["Tommy Cooper", 0]]
evidences: [["Thomas Henty", "father", "Tommy Cooper"], ["Tommy Cooper", "date of death", "15 April 1984"]]
answer: 15 April 1984