Question: Richard Kenneth Djerf's case is often compared with that of a murderer who killed his wife, mother, and three children on what date?
Context: Richard Kenneth Corkill (born 1951) was the Chief Minister of the Isle of Man, December 2001 to December 2004 and an elected member of the House of Keys from 1991 to 2006.  He was born in Douglas, Isle of Man.  He was elected by Tynwald with 21 votes, defeating Edgar Quine, who received 10 votes. Edward O'Grady II (August 20, 1948 – October 20, 1981) was a Nyack police officer who was killed in connection with a 1981 robbery of a Brinks armored car (see Brinks Robbery (1981)).  He left behind a wife and three children.  O'Grady was born in Nyack, New York.  After graduating high school, he joined the United States Marine Corps and served two tours of service in the Vietnam War.  O'Grady joined the Nyack Police department after his discharge and also worked as a volunteer fire fighter with the Nyack fire department.  In 1976, O'Grady was promoted to sergeant, the youngest person in the history of Rockland County, New York to achieve that rank.  At the time of his death, he was enrolled at St. Thomas Aquinas College and was close to receiving his bachelor's degree in criminal justice.  He was survived by his wife and three children.  His son, Edward J. O'Grady III, went on to join the United States Navy, graduating from the United States Naval Academy in 1997. Richard Kenneth Davis (born July 27, 1942) is a former American football player in the National Football League.  He played for the Baltimore Colts, the New Orleans Saints, and the Miami Dolphins.  He played collegiately for the Georgia Tech football team.  He was inducted into the Georgia Tech Hall of Fame in 1980. Erzhu Rong (爾朱榮) (493 – November 1, 530), courtesy name Tianbao (天寶), formally Prince Wu of Jin (晉武王), was a general of the Chinese/Xianbei dynasty Northern Wei.  He was of Xiongnu ancestry, and after Emperor Xiaoming was killed by his mother Empress Dowager Hu in 528, Erzhu overthrew her and put Emperor Xiaozhuang on the throne, but at the same time slaughtered many imperial officials and took over most of actual power either directly or through associates.  He then contributed much to the rebuilding of the Northern Wei state, which had been rendered fractured by agrarian rebellions during Emperor Xiaoming's reign.  However, in 530, Emperor Xiaozhuang, believing that Erzhu would eventually usurp the throne, tricked Erzhu into the palace and ambushed him.  Subsequently, however, Erzhu's clan members, led by his cousin Erzhu Shilong and nephew Erzhu Zhao, defeated and killed Emperor Xiaozhuang.  He was often compared by historians to the Han Dynasty general Dong Zhuo, for his ferocity in battle and for his violence and lack of tact. John Emil List (September 17, 1925 – March 21, 2008) was an American multiple murderer and long-time fugitive.  On November 9, 1971, he killed his wife, mother, and three children in their home in Westfield, New Jersey, then disappeared.  He had planned the murders so meticulously that nearly a month passed before anyone suspected that anything was amiss. Shirley Winters (born February 27, 1958) is a convicted murderer and arsonist from upstate New York.  In 1980, she smothered her five-month-old son, Ronald Winters III.  In 2007, she drowned 23-month-old Ryan Rivers.  She is suspected of setting a fire which killed her two older children in 1979, and one the day prior that killed a friend's three children.  Per a plea bargain, she cannot be prosecuted for those. Richard Kenneth Djerf (born November 6, 1969) is an American mass murderer, currently on death row in Florence, Arizona.  His case is often compared with that of John List, with the exception that Djerf killed someone else’s family. Richard Kenneth "Ritchie" Hanlon (born 26 May 1978) is an English retired footballer, who played as a Midfielder.  He played in the Football League with Southend United, Peterborough United, Rushden & Diamonds and Lincoln City.  Hanlon also played non-League football with Welling United, Stevenage Borough, Weymouth and Cambridge United.  He was forced to retire aged 28 with a knee injury. Jim Harris is an American novelist.  He has written three acclaimed novels in the 21st Century, one of which was nominated for a Pen USA award.  He writes comic novels about the human condition with characters who are almost always marginalized.  His style is often compared to Tom Robbins and Kurt Vonnegut but his content is rougher-edged and often compared to Jim Thompson and Cormac McCarthy with more comic overtones.  His unique approach to his characters delineates him from most other comic American male writers, as females are the lead characters in all of his novels. Hesham Selim (Arabic: هشام سليم‎ ‎ ) is an Egyptian actor and the son of Saleh Selim.  He has made many movies and television series since his childhood.  He has been married twice.  Mervat El Nahas was his first wife which is the mother of his three children.  Nadia Al Ghaleb is his second and they have been together since 2004.  He began his acting career at age 13 but took his schooling seriously and did not act again until he had graduated.  He is the father of three children, (Noor Selim/ Zein Al Sharaf Selim/ Esmat Selim).
Answer: November 9, 1971