People acquitted by reason of insanity

Bertha Gifford (October 1872 – August 20, 1951) was a farmwife in rural Catawissa, Missouri during the early 1900s who was accused of murdering 17 members of the local community.

Shūmei Ōkawa (大川 周明 Ōkawa Shūmei, December 6, 1886 – December 24, 1957) was a Japanese nationalist, Pan-Asian writer, indicted war criminal, and Islamic scholar.

Howard Barton Unruh (January 21, 1921 – October 19, 2009) was an American mass murderer (sometimes classified as a spree killer) who killed 13 people (including three children) during a 12-minute walk through his neighborhood on September 6, 1949, in Camden, New Jersey, when he was 28 years old.

Jane Toppan aka (Jolly Jane) (1857–1938), born Honora Kelley, was an American serial killer.

Alexander Nikolayevich Spesivtsev (Russian: Александр Николаевич Спесивцев, born 1 March 1970) is a Russian serial killer, also known as The Novokuznetsk Monster and The Siberian Ripper, convicted for the killing of 4 people in Novokuznetsk in 1996.

William Stanley Milligan (February 14, 1955 – December 12, 2014), known as Billy Milligan, was an American citizen who was the subject of a highly publicized court case in Ohio in the late 1970s.

James Edward Swann, Jr.

Graham Frederick Young (7 September 1947 – 1 August 1990) was an English serial killer who used poison to kill his victims.

Cayetano Santos Godino (October 31, 1896 – November 15, 1944), also known as "Petiso Orejudo" ("Macrotous Runt"), was an Argentinian serial killer who terrorized Buenos Aires at the age of 16.

Edward Theodore Gein (/ˈɡiːn/; August 27, 1906 – July 26, 1984) was an American murderer and body snatcher.

"Sister" Amy Duggan Archer-Gilligan (October 1868 – April 23, 1962) was a Windsor, Connecticut, nursing home proprietor and serial killer.

Nikolai Dzhumagaliev (Cyrillic: Николай Джумагалиев or Жұмағалиев, born 1952) is a Soviet serial killer, also known as Metal Fang, convicted for the killing of 7 people in the Kazakh SSR (now Kazakhstan) between 1979 and 1980.

William Chester Minor, also known as W.

Ernst August Wagner (22 September 1874 – 27 April 1938) was a German mass murderer who, on 4 September 1913 killed his wife and four children in Degerloch.

Henry Reed Rathbone (July 1, 1837 – August 14, 1911) was a United States military officer and diplomat who was present at the assassination of President Abraham Lincoln.

Robert John Maudsley (born June 1953) is a British serial killer responsible for the murders of four people.

Harry Kendall Thaw (February 12, 1871 – February 22, 1947) was the son of Pittsburgh coal and railroad baron William Thaw, Sr.

Francis T. "Mickey" Featherstone (born June 3, 1949) is a former Irish American mobster and member of the Westies, an organized crime syndicate from Hell's Kitchen, Manhattan in New York City, led by James Coonan.

Adolph Bernard Spreckels (January 5, 1857 – June 28, 1924) was a California businessman who ran Spreckels Sugar Company and who donated the California Palace of the Legion of Honor art museum to the city of San Francisco in 1924.

Alice Jessie Mitchell was an American murderer.

John Flammang Schrank (March 5, 1876 – September 15, 1943) was a resident of New York, best known for his attempt to assassinate former U.

Jonathan Martin (1782– 3 June 1838) was an English arsonist, famous for setting fire to York Minster in 1829.

Jeanne Weber (7 October 1874 – 5 July 1918) was a French serial killer.

Gregory Davis (born 1979) is an English spree killer and former art student who was convicted of the double manslaughter of Dorothy Rogers and her son Michael Rogers in 2003.

June and Jennifer Gibbons (born 11 April 1963; Jennifer died March 1993) were identical twins who grew up in Wales.

James Hadfield or Hatfield (1771/1772 – 23 January 1841) attempted to assassinate George III of the United Kingdom in 1800 but was acquitted of attempted murder by reason of insanity.

Marcelo Costa de Andrade (born January 2, 1967), a.

(Not to be confused with Daniel McNaughton.) Daniel M'Naghten (pronounced, and sometimes spelled, McNaughtan or McNaughton) (1813–1865) was a Scottish woodturner who assassinated English civil servant Edward Drummond while suffering from paranoid delusions.

Frederick Mors (2 October 1889 – after 1916) was an Austrian serial killer who, while employed in a nursing home in New York City, killed eight elderly patients by poisoning.

George Roden (January 17, 1938 – December 6, 1998), was a leader of the Branch Davidian sect, a Seventh-day Adventist splinter group, and the former husband of Amo Bishop Roden.

Elizabeth "Lizzie" Lloyd King (born 1847) was the alleged murderer of Charles Goodrich, whom she is said to have shot three times in the head on 20 March 1873 in Brooklyn, New York, United States.

Thomas John Ley (28 October 1880 – 29 July 1947) was an Australian politician who was convicted of murder in England.

William Jesus Marrufo was the drummer for the band Ozomatli.

Kenneth Erskine (born July 1963) is a British serial killer who became known as the Stockwell Strangler.

Mark Rowntree is a British spree killer who was committed to a mental hospital after he admitted killing four people at random in the town of Bingley, West Yorkshire, during late 1975 and early 1976.

Mathew Charles "Matt" Lamb (5 January 1948 – 7 November 1976) was a Canadian spree killer who, in 1967, avoided Canada's then-mandatory death penalty for capital murder by being found not guilty by reason of insanity.

Robert Clive Napper (born 25 February 1966) is a British criminal.

Edward Oxford (19 April 1822 – 23 April 1900) was the first of eight people who tried to assassinate Queen Victoria.

Richard Lawrence (c. 1800 – June 13, 1861) was an American house painter.

Christian Dornier (born July 15, 1958) is a French mass murderer, who shot to death his sister and mother and wounded his father with a 12-gauge double-barrelled shotgun at their farm on July 12, 1989.

John Warnock Hinckley Jr.

Anthony "Tony" G.

Dena Schlosser (born 1969) is a Plano, Texas woman who, on November 22, 2004, used a knife to amputate the arms of her eleven-month-old daughter, Margaret, who died as a result.

Jeffrey Robert Arenburg (born December 30, 1956) is a Canadian gunman.