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?

Context articles: List of Scream Queens characters
How to Be a Serial Killer
Steve Wright (serial killer)
Graham Young
Levi Bellfield
Trevor Hardy
John Straffen
Cold Fish
Edward Eveleigh
The Young Poisoner's Handbook

The following is a list of characters from the Fox black comedy horror series "Scream Queens".
 The first season focuses on the Kappa Kappa Tau sorority in Wallace University, led by Chanel Oberlin (Emma Roberts), that is being targeted by a serial killer who uses the Red Devil mascot uniform.
 The second season focuses on the murder spree committed by another serial killer using a Green Meanie costume at the C.U.R.E. institute, a new hospital where Chanel and her friends work.
How to Be a Serial Killer is a 2008 American black comedy film about a young serial killer who imparts his knowledge to an eager pupil.
 Written and directed by Luke Ricci, the film stars Dameon Clarke, Matthew Gray Gubler, Laura Regan, and George Wyner.
Steven Gerald James Wright (born 24 April 1958) is an English serial killer, also known as the Suffolk Strangler and the Ipswich Ripper.
 He is serving life imprisonment for the murder of five women who worked as prostitutes in Ipswich, Suffolk.
 The killings took place during the final months of 2006, and Wright was found guilty in February 2008.
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.
Yusuf Rahim (born Levi Rabetts; 17 May 1968), formerly known as Levi Bellfield, is an English serial killer.
 He was convicted on 25 February 2008 of the murders of Marsha McDonnell and Amelie Delagrange and the attempted murder of Kate Sheedy, and sentenced to life imprisonment.
Trevor Joseph Hardy (11 June 1945 – 25 September 2012), also known as the Beast of Manchester, was a convicted English serial killer who murdered three teenage girls in the Manchester area between December 1974 and March 1976.
 In 1977, he was found guilty on three charges of murder and was sentenced to life imprisonment, remaining in prison until his death 35 years later.
John Thomas Straffen (27 February 1930 – 19 November 2007) was an English serial killer who was the longest-serving prisoner in British legal history.
 Straffen killed two young girls in the summer of 1951.
 He was found to be unfit to plead and committed to Broadmoor Hospital; during a brief escape in 1952, he killed again.
 This time, he was convicted of murder and sentenced to death.
 Reprieved because of his mental state, he had his sentence commuted to life imprisonment, and he remained in prison until his death more than 55 years later.
Cold Fish (冷たい熱帯魚 , Tsumetai Nettaigyo ) is a 2010 Japanese horror-drama serial killer film directed by Sion Sono.
 The film is about a quiet and unambitious owner of a tropical fish shop whose life and family are taken over by a fellow fish entrepreneur who happens to be a serial killer.
 The film is loosely based on the exploits of two Tokyo serial killers, Sekine Gen and Hiroko Kazama, a husband and wife duo who owned a pet shop and murdered at least four people.
Sir Edward Walter Eveleigh, ERD, PC (8 October 1917 - 24 September 2014) was a British barrister, judge and British Army officer.
 He presided over a number of high-profile cases including that of the serial killer Graham Young and the former MP John Stonehouse.
 He went on to serve as a Lord Justice of Appeal from 1977 to 1985.
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.