Question: Who was the long-term partner of the owner of Watford Football Club (1976 to 1987) who died in 1992?

full_context: Document 1: Elton John videography: The videography of Elton John consists of 118 music videos and 17 video albums. Since 1970, John has continually released promotional music videos, beginning with "Your Song" and only sporadically releasing videos thereafter. It was not until "Visions" in 1981, a release that included music videos of every song from his album "The Fox", as well as the rise of MTV, that he began to release videos more frequently. He had usually appeared in his music videos, but after 2001, John began appearing less and less in his own videos, sometimes opting to have other actors, such famous names as Justin Timberlake and Robert Downey, Jr., lip-synch the lyrics.
Document 2: Rocket Man (song): "Rocket Man" (officially titled as Rocket Man (I Think It's Going to Be a Long, Long Time)), is a song composed by Elton John and Bernie Taupin and originally performed by John. The song first appeared on John's 1972 album "Honky Château" and became a hit single, rising to No. 2 in the UK and No. 6 in the US. On 21 October 2016, the song was certified Silver by the British Phonographic Industry for sales of 200,000 digital downloads.
Document 3: Elton John AIDS Foundation: The Elton John AIDS Foundation (EJAF) is a nonprofit organization, established by rock musician Sir Elton John in 1992 in the United States and 1993 in the United Kingdom to support innovative HIV prevention, education programs, direct care and support services to people living with HIV.
Document 4: Buck Owens: Alvis Edgar "Buck" Owens Jr. (August 12, 1929 – March 25, 2006) was an American musician, singer, songwriter and band leader who had 21 No. 1 hits on the "Billboard" country music charts with his band the Buckaroos. They pioneered what came to be called the Bakersfield sound, a reference to Bakersfield, California, the city Owens called home and from which he drew inspiration for what he preferred to call American music.
Document 5: Vance Buck: Vance Matthew Buck (February 5, 1961 – July 6, 1992) was an American entrepreneur, best known for his long-term relationship with Elton John.
Document 6: Sally Buck: Sara Long "Sally" Buck (born 1930 - died August 23, 2014) was a part-owner of the Philadelphia Phillies baseball team. She and her late husband, Alexander Buck, joined the team's ownership group in 1981. She became a partner upon her husband's death in 2010.
Document 7: Elton John singles discography: The singles discography of British musician/singer-songwriter Elton John consists of 133 official singles and 17 as featured artist, as well as 47 other non-single guest appearances. Across his career, John has yielded 57 top 40 hits in the United States, only second to Elvis Presley in total, with 27 of those hitting the top ten and 9 achieving number-one. In his native United Kingdom, he has accumulated 69 top 40 singles, including 32 top tens and 7 number-ones. In 1997, John released the double A-side single "Something About the Way You Look Tonight"/"Candle in the Wind 1997" in dedication to the memory of Diana, Princess of Wales. It subsequently hit number-one in every country that it charted in and became the biggest selling single of all-time since the UK and US charts began in the 1950s, with sales of 33 million. John has sold 100 million singles worldwide.
Document 8: The Goaldiggers Song: "The Goaldiggers Song" is a charity single by Elton John, released in 1977. The song is written for the Goaldigger's charity to provide playing fields in under-privileged areas. At the time in 1977, Elton John was living reclused in London; the only time he would go out was to go see his football team Watford F.C. play. The single never charted anywhere, as it was a limited charity release-only 500 copies were pressed, approximately half of which were signed by Elton. It was available for a cost of five UK pounds by mail-order only and featured Elton and a number of other British celebrities including Jimmy Hill and Eric Morecombe in conversation on the B-side. The tapes were destroyed after the pressing, so no other official copies of the recording exist.
Document 9: Lennon–McCartney: Lennon–McCartney was the songwriting partnership between English musicians John Lennon (9 October 19408 December 1980) and Paul McCartney (born 18 June 1942) of the Beatles. It is one of the best known and most successful musical collaborations in history, with the Beatles selling over 600 million records, tapes and CDs as of 2004. Between 1962 and 1969, the partnership published approximately 180 jointly credited songs, of which the vast majority were recorded by the Beatles, forming the bulk of their catalogue.
Document 10: Elton John: Sir Elton Hercules John, (born Reginald Kenneth Dwight; 25 March 1947), is an English singer, pianist, and composer. He has worked with lyricist Bernie Taupin as his songwriting partner since 1967; they have collaborated on more than 30 albums to date. In his five-decade career Elton John has sold more than 300million records, making him one of the best-selling music artists in the world. He has more than fifty Top 40 hits, including seven consecutive No. 1 US albums, 58 "Billboard" Top 40 singles, 27 Top 10, four No. 2 and nine No. 1. For 31 consecutive years (1970–2000) he had at least one song in the "Billboard" Hot 100. His tribute single, re-penned in dedication to the late Princess Diana, "Candle in the Wind 1997" sold over 33million copies worldwide and is the best-selling single in the history of the UK and US singles charts. He has also composed music, produced records, and has occasionally acted in films. John owned Watford Football Club from 1976 to 1987, and 1997 to 2002. He is an honorary Life President of the club, and in 2014 had a stand named after him at the club's home stadium.
Document 11: List of best-selling singles: According to "Guinness World Records", "White Christmas" (1942) by Bing Crosby is the best-selling single worldwide, with estimated sales of over 50 million copies. The song recognized as "the best-selling single of all time" was released before the pop/rock singles-chart era and "was listed as the world's best-selling single in the first-ever "Guinness Book of Records" (published in 1955) and—remarkably—still retains the title more than 50 years later." "Guinness World Records" states that double A-side charity single "Candle in the Wind 1997"/"Something About the Way You Look Tonight" (1997) by Elton John, a tribute to the late Diana, Princess of Wales, is "the biggest-selling single since UK and US singles charts began in the 1950s, having accumulated worldwide sales of 33 million copies," making it the second-best-selling single of all time.
Document 12: Bernie Taupin: Bernard John Taupin (born 22 May 1950) is an English lyricist, poet, and singer, best known for his long-term collaboration with Elton John, writing the lyrics for the majority of the star's songs, and making his lyrics some of the best known in music history.
Document 13: Vince Buck: Vincent Lamont Buck (born January 12, 1968 in Owensboro, Kentucky) is a former American football safety in the National Football League for the New Orleans Saints. He played college football at Central State University in Wilberforce, Ohio, where Buck was an NAIA All-American and NAIA Player of the Year in his senior year 1989. He was drafted in the 2nd round of the 1990 NFL Draft by the New Orleans Saints, where he played six seasons. After his playing career was over, Buck has been active in the New Orleans community. Vince Buck is currently the owner and proprietor of a Cottman transmission service center in New Orleans, and resides in Kenner, Louisiana.
Document 14: Cliff Richard: Sir Cliff Richard {'1': ", '2': ", '3': 'OBE', '4': "} (born Harry Rodger Webb, 14 October 1940) is a British pop singer, musician, performer, actor and philanthropist. Richard has sold more than 250 million records worldwide. He has total sales of over 21 million singles in the United Kingdom and is the third-top-selling artist in UK Singles Chart history, behind the Beatles and Elvis Presley.
Document 15: Elton John: Me, Myself &amp; I: Elton John: Me, Myself & I is a 2007 documentary filmed after the death of Elton John's good friend Diana and other soul shaking events that caused him to reassess his life. It is a candid appraisal by Elton John (tongue in cheek) of his fame, drug use, sexuality, and mistakenly taking his life for granted. It was filmed in Las Vegas, Nevada, United States
ground_truth: Vance Matthew Buck