Question: What year did the man, who was impersonated by Roger Kitter in the Lego advertisement, die of a heart attack?

full_context: Document 1: Harry H. Corbett: Harry H. Corbett, OBE (28 February 192521 March 1982) was an English actor. Corbett is best known for his co-starring role in the popular and long-running BBC Television sitcom "Steptoe and Son" which was first broadcast in the 1960s and 1970s.
Document 2: Roger Miller: Roger Dean Miller, Sr. (January 2, 1936 – October 25, 1992) was an American singer-songwriter, musician, and actor, best known for his honky-tonk-influenced novelty songs. His most recognized tunes included the chart-topping country and pop hits "King of the Road", "Dang Me", and "England Swings", all from the mid-1960s Nashville sound era.
Document 3: Uncle Albert: Albert Gladstone Trotter, better known as Uncle Albert, is a fictional character in the BBC sitcom "Only Fools and Horses". He was introduced during the fourth series as a replacement for the character of Grandad due to the sudden death of actor Lennard Pearce in 1984. He was portrayed by Buster Merryfield.
Document 4: Thomas Haller Cooper: Thomas Haller Cooper, (29 August 1919 – 1987), also known as Tom Böttcher, was a member of the German Waffen-SS British Free Corps and former member of the British Union of Fascists.
Document 5: Johnny Thompson: Johnny Thompson (born c. 1934) is a Polish-American comedian and Las Vegas illusionist who performs under the stage name The Great Tomsoni with his wife, Pamela Hayes. They have a comedic slapstick act with the well-dressed Thompson and his gum-popping assistant, Pam, performing illusions while enduring a series of mishaps. Within the magician community, Tomsoni is considered a virtuoso, widely known as a mentor and teacher of magic, and a creator of tricks, as opposed to simply a performer. He has worked behind the scenes with magicians such as Penn and Teller, Lance Burton, Criss Angel and Mat Franco. In 1999, he was awarded one of the highest honors in the magician community, a Masters Fellowship with the Academy of Magical Arts.
Document 6: Cannon and Ball: Tommy Cannon (born Thomas Derbyshire, 27 June 1938) and Bobby Ball (born Robert Harper, 28 January 1944), known collectively as Cannon and Ball, are an English comedy double act best known for their comedy variety show "The Cannon and Ball Show", which lasted for nine years on ITV. The duo met in the early 1960s while working as welders in Oldham, Lancashire. They started out as singers working the pubs and clubs of Greater Manchester and switched to comedy after being told comics earned an extra £3 a night.
Document 7: Del Boy: Derek Edward Trotter, more commonly known as Del Boy (born 12 July 1945), is the fictional lead character in the popular BBC sitcom "Only Fools and Horses" and one of the main characters of its prequel, "Rock & Chips". He was played by David Jason in the original series and was portrayed as a teenager by James Buckley in the prequel. Del is known for his broken French quotes which are usually completely out of context and a variety of catchphrases, including: "He who dares – wins!", "This time next year we'll be millionaires", "Lovely Jubbly!", "You know it makes sense" (which he usually says to his customers after they've agreed on a deal) and "You plonker!" (which he usually says to Rodney).
Document 8: Bobby Ball: Robert Harper, known professionally as Bobby Ball (born 28 January 1944), is an English comedian, actor and singer. He is best known as one half of the double act Cannon and Ball, with Tommy Cannon. They hosted their own ITV show "The Cannon and Ball Show" for nine years between 1979 and 1988. Ball has since gone on to star in various sitcoms and dramas including "Last of the Summer Wine", "Heartbeat" and "Not Going Out".
Document 9: Tommy Cooper: Thomas Frederick "Tommy" Cooper (19 March 1921 – 15 April 1984) was a British prop comedian and magician. Cooper was a member of the Magic Circle, and respected by traditional magicians. He was famed for his red tarboosh, and his appearance was large and lumbering, at 6 ft and more than 15 st in weight. On 15 April 1984, Cooper collapsed with a heart attack on live national television, and died soon afterwards.
Document 10: Roger Kitter: Roger Kitter (20 October 1949 – 3 January 2015) was an English actor best known for playing Captain Alberto Bertorelli in series 7 of the British sitcom TV series "'Allo 'Allo!". He had previously appeared weekly with Lulu throughout the 10-week run of her 1973 BBC1 series "It's Lulu". With Kaplan Kaye he also recorded a song "Chalk Dust – the Umpire Strikes Back" using the moniker 'The Brat'. Released on the Hansa label, it entered the UK Singles Chart on 10 July 1982; it reached a peak of number 19, and remained in the chart for 8 weeks. The song was a Top 10 hit in the Netherlands, Belgium and South Africa, and lampooned John McEnroe complaining about line calls in tennis ("The ball's in, everyone can see that the ball's in!"). He was also an impressionist, who provided the voice of Tommy Cooper in the Lego 'Kipper' advertisement.
Document 11: René Artois: René François Artois is a fictional character, the main character in the BBC sitcom "'Allo 'Allo!", which ran from 1982 to 1992. The character was played by Gorden Kaye. In the 2009 stage production of 'Allo 'Allo!, the part was played by Jeffrey Holland.
Document 12: Jack Haig: Jack Haig (born John Cecil Coppin, 5 January 1913 – 4 July 1989) was an English actor who specialised in supporting roles, mainly in Television comedy, he was best known for his role on sitcom 'Allo 'Allo! as Monsieur Roger LeClerc
Document 13: Paul Daniels: Newton Edward "Paul" Daniels (6 April 1938 – 17 March 2016) was an English magician and television presenter. Daniels achieved international fame through his television series "The Paul Daniels Magic Show", which ran on the BBC from 1979 to 1994. He was known for his catchphrase of "You'll like this ... not a lot, but you'll like it" and also for his marriage to his assistant, Debbie McGee. He was awarded the "Magician of the Year’" Award by the Academy of Magical Arts in 1982, the first magician from outside the United States to receive it. He also won the Golden Rose of Montreux in 1985.
Document 14: Thomas Henty: Thomas Henty (19January 195613August 1988) was an English actor, and the son of the magician and prop comedian Tommy Cooper.
Document 15: Tommy Cannon: Thomas Derbyshire, known professionally as Tommy Cannon (born 27 June 1938), is an English comedian and singer. He is best knows as the straight man of comedy double act Cannon and Ball, along with Bobby Ball. He is most well known for the show "The Cannon and Ball Show".
ground_truth: 1984