Question: What method of murder was used by English serial killer Graham Young whose life was portrayed in a 1995 black comedy film directed by Benjamin Ross?

full_context: Document 1: A Bucket of Blood: A Bucket of Blood is a 1959 American black comedy horror film directed by Roger Corman. It starred Dick Miller and was set in beatnik culture. The film, produced on a $50,000 budget, was shot in five days and shares many of the low-budget filmmaking aesthetics commonly associated with Corman's work. Written by Charles B. Griffith, the film is a dark comic satire about a dimwitted, impressionable young busboy at a Bohemian café who is acclaimed as a brilliant sculptor when he accidentally kills his landlady's cat and covers its body in clay to hide the evidence. When he is pressured to create similar work, he becomes murderous.
Document 2: Dennis Nilsen: Dennis Andrew Nilsen (born 23 November 1945) is a Scottish serial killer and necrophiliac, also known as the Muswell Hill Murderer and the Kindly Killer, who murdered at least 12 young men in a series of killings committed between 1978 and 1983 in London, England. Convicted of six counts of murder and two of attempted murder at the Old Bailey, Nilsen was sentenced to life imprisonment on 4 November 1983, with a recommendation that he serve a minimum of 25 years. He is currently incarcerated at HMP Full Sutton maximum security prison in Full Sutton in the East Riding of Yorkshire, England.
Document 3: Graham Young: Graham Frederick Young (7 September 1947 – 1 August 1990) was an English serial killer who used poison to kill his victims. He was sent to Broadmoor Hospital in 1962 after poisoning several members of his family, killing his stepmother. After his release in 1971 he went on to poison 70 more people, two of whom died. Young, who was known as the Teacup Poisoner, was then sent to Parkhurst Prison where he died of a heart attack in 1990.
Document 4: Uwantme2killhim?: uwantme2killhim? (also known as U Want Me 2 Kill Him? and stylized as "Uwantme2killhim?") is a 2013 drama-thriller film directed by Andrew Douglas. The film stars Jamie Blackley and Toby Regbo and premiered at the Edinburgh International Film Festival, where the two actors won the "Best performance in a British feature film" award. The film is loosely based on a true story and follows two teenage schoolboys who are drawn into a complicated world of online chatrooms, eventually leading to one stabbing the other.
Document 5: The Young Poisoner's Handbook: The Young Poisoner's Handbook is a 1995 British-German-French-produced black comedy film based on the life of Graham Young, more commonly known as "The Teacup Murderer". It was directed by Benjamin Ross and written by Ross and Jeff Rawle. The film stars Hugh O'Conor in the lead role.
Document 6: Kill Your Friends (film): Kill Your Friends is a 2015 British dark comedy crime-thriller film directed by Owen Harris, script written by John Niven based on his own written 2008 novel of the same name. The film stars Nicholas Hoult, Craig Roberts, Tom Riley, and Georgia King. The film was selected to be shown in the City to City section of the 2015 Toronto Film Festival. The film was released on 6 November 2015 by StudioCanal.
Document 7: Rosemary West: Rosemary Pauline "Rose" West ("née" Letts; born 29 November 1953) is a British serial killer, now an inmate at HMP Low Newton, Brasside, Durham, after being convicted of ten murders in 1995. Her husband Fred, who committed suicide in prison while awaiting trial, is believed to have collaborated with her in the torture and murder of at least nine young women between 1973 and 1987, whereas Rose was judged to have murdered her 8-year-old stepdaughter, Charmaine, in 1971. The majority of these murders were committed at the couple's home, 25 Cromwell Street in Gloucester, England.
Document 8: Daniel Gonzalez (spree killer): Daniel Gonzalez (1980 – 9 August 2007), also known as the Freddy Krueger Killer and the Mummy's Boy Killer, was a spree killer who killed four people and injured two others during two days across London and Sussex in September 2004. His mother had previously written a letter to her MP criticising the fact that a serious incident had to occur before he could receive mental help. In her letter, she rhetorically asked "...does my son have to commit murder to get help?".
Document 9: Burke &amp; Hare (2010 film): Burke & Hare is a 2010 British black comedy film, loosely based on the Burke and Hare murders. Directed by John Landis, the film stars Simon Pegg and Andy Serkis as William Burke and William Hare respectively. It was Landis's first feature film release in 12 years, the last being 1998's "Susan's Plan". The film was released in the United Kingdom on 29 October 2010.
Document 10: Harold Shipman: Harold Frederick Shipman (14 January 1946 – 13 January 2004) was a British general practitioner and one of the most prolific serial killers in recorded history. On 31 January 2000, a jury found Shipman guilty of fifteen murders for killing patients under his care. He was sentenced to life imprisonment with the recommendation that he never be released.
Document 11: Allan Grimson: Allan Grimson (born 1958) is a convicted British murderer who is responsible for murdering at least two men and is suspected of killing others, possibly up to another 20 undiscovered victims. The judge, who sentenced him to a minimum term of 22 years at his trial, said that Grimson was a serial killer by nature, but not by number. Because his two victims were killed on the same date just a year apart (12 December), detectives believe there may be more victims out there as yet unidentified.
Document 12: Fred West: Frederick Walter Stephen West (29 September 1941 – 1 January 1995) was an English serial killer who committed at least 12 murders between 1967 and 1987 in Gloucestershire, the majority with his second wife, Rosemary West.
Document 13: Urge to Kill (film): Urge to Kill is a 1960 British B-movie serial killer film, directed by Vernon Sewell and starring Patrick Barr, Ruth Dunning and Terence Knapp. The film is based on the novel "Hughie Roddis" and play "Hand in Glove", both by Gerald Savory. It is regarded as a minor cult film thanks to its unrelenting shabby grimness and some unintentionally comic, dated and politically incorrect dialogue – one suspect is repeatedly referred to as "a mental case", while the police, trying to work out why one hapless victim was selected for her grisly fate, speculate "perhaps she was a Jezebel."
Document 14: The Black Hand Gang: The Black Hand Gang is a 1930 British comedy film directed by Monty Banks and starring Wee Georgie Wood, Viola Compton and Alfred Wood. It was made by British International Pictures and based on a play by "Black Hand George" by Bert Lee and R.P. Weston.
Document 15: Paul Grimes (criminal): Paul Grimes (born 26 May 1950) is a former gangster who, from an early age, was active in Liverpool's criminal underworld. He has 38 criminal convictions and was involved in a range of violent and illegal activities. He also set up legal businesses recycling scrap metal and disposing of waste. He was rich, successful and at the top of the gangster hierarchy when his son Jason died of a heroin overdose in 1992, at the age of 21. This tragedy led to Grimes becoming a police informer with the aim of bringing down the drug dealers who he felt had destroyed his son's life. His evidence has led to successful prosecutions against high-profile dealers such as John Haase and Curtis Warren. The information Grimes provided also led to his son Heath being jailed for five years.
ground_truth: poison