Question: What is the date of death of Sissel Lange-Nielsen's husband?

Knowledge 1: Sissel Lange-Nielsen
Sissel Lange-Nielsen, née Herlofson (born 27 January 1931) is a Norwegian writer, literary critic, and journalist.Born in Kristiansund, she won the Riksmål Society Literature Prize in 1982.She is a member of the Norwegian Academy for Language and Literature.She was married to barrister and judge Trygve Lange-Nielsen (1921–2014). [SEP] Knowledge 2: Trygve Lange-Nielsen
Trygve Lange-Nielsen (9 July 1921 – 18 April 2014) was a Norwegian barrister and judge.He was born in Kristiania as a son of Fredrik Lange-Nielsen (1891–1980) and Laura Stang Lund (1893–1961).He was a maternal grandson of Fredrik Stang Lund.In 1953 he married Sissel Herlofson.He finished his secondary education in 1940 and graduated with the cand.jur. degree in 1947.He was hired in the Office of the Attorney General of Norway in 1951, and worked here until 1972, only interrupted by a few years in his own law firm.From 1956 he was a barrister, with access to working with Supreme Court cases.From 1972 to 1991 he was a presiding judge in Eidsivating Court of Appeal.Despite passing the normal retirement age, he was then an extraordinary judge in Oslo City Court from 1991 to 1995.His special fields included insurance law—he chaired "Norsk forsikringsjuridisk avdeling" from 1971 to 1982—and tort law, in which he lectured at the University of Oslo.He did however become better known for unveiling and overturning miscarriage of justice cases, an endeavor to which he dedicated his later life.Lange-Nielsen also chaired the Norwegian Association of Lawyers from 1971 to 1975.He resided in Skarpsno.He died in April 2014 in Oslo, following three weeks of illness.
Knowledge 1: Sissel Lange-Nielsen
Sissel Lange-Nielsen, née Herlofson (born 27 January 1931) is a Norwegian writer, literary critic, and journalist.Born in Kristiansund, she won the Riksmål Society Literature Prize in 1982.She is a member of the Norwegian Academy for Language and Literature.She was married to barrister and judge Trygve Lange-Nielsen (1921–2014). [SEP] Knowledge 2: Etan Boritzer
Etan Boritzer( born 1950) is an American writer of children ’s literature who is best known for his book" What is God?" first published in 1989.His best selling" What is?" illustrated children's book series on character education and difficult subjects for children is a popular teaching guide for parents, teachers and child- life professionals.Boritzer gained national critical acclaim after" What is God?" was published in 1989 although the book has caused controversy from religious fundamentalists for its universalist views.The other current books in the" What is?" series includeWhat is Love?,What is Death?,What is Beautiful?,What is Funny?,What is Right?,What is Peace?,What is Money?,What is Dreaming?,What is a Friend?,What is True?,What is a Family?,What is a Feeling?"The series is now also translated into 15 languages.Boritzer was first published in 1963 at the age of 13 when he wrote an essay in his English class at Wade Junior High School in the Bronx, New York on the assassination of John F. Kennedy.His essay was included in a special anthology by New York City public school children compiled and published by the New York City Department of Education.Boritzer now lives in Venice, California and maintains his publishing office there also.He has helped numerous other authors to get published through" How to Get Your Book Published!" programs.Boritzer is also a yoga teacher who teaches regular classes locally and guest- teaches nationally.He is also recognized nationally as an erudite speaker on" The Teachings of the Buddha."
Knowledge 1: Fred Lange-Nielsen
Fred Lange- Nielsen( 28 September 1919 – 28 December 1989) was a Norwegian doctor and jazz musician( bass, vocals), known in the early Oslo environments, and from several recordings.Lange- Nielsen and Anton Jervell were the first to describe Jervell and Lange- Nielsen syndrome( JLNS) in 1953.He played in String Swing( 1937- 1941), the quartet Hot Dogs, in Rowland Greenberg's orchestra( 1941), the Oslo Swing Club's orchestra, the studio group Seven Cheerful and with Cecil Aagaard's" Swingsters" and quintet Sew- We- La( 1950 53). [SEP] Knowledge 2: Etan Boritzer
Etan Boritzer( born 1950) is an American writer of children ’s literature who is best known for his book" What is God?" first published in 1989.His best selling" What is?" illustrated children's book series on character education and difficult subjects for children is a popular teaching guide for parents, teachers and child- life professionals.Boritzer gained national critical acclaim after" What is God?" was published in 1989 although the book has caused controversy from religious fundamentalists for its universalist views.The other current books in the" What is?" series includeWhat is Love?,What is Death?,What is Beautiful?,What is Funny?,What is Right?,What is Peace?,What is Money?,What is Dreaming?,What is a Friend?,What is True?,What is a Family?,What is a Feeling?"The series is now also translated into 15 languages.Boritzer was first published in 1963 at the age of 13 when he wrote an essay in his English class at Wade Junior High School in the Bronx, New York on the assassination of John F. Kennedy.His essay was included in a special anthology by New York City public school children compiled and published by the New York City Department of Education.Boritzer now lives in Venice, California and maintains his publishing office there also.He has helped numerous other authors to get published through" How to Get Your Book Published!" programs.Boritzer is also a yoga teacher who teaches regular classes locally and guest- teaches nationally.He is also recognized nationally as an erudite speaker on" The Teachings of the Buddha."

Answer: 18 April 2014