James Eagan Holmes (born December 13, 1987) is an American convicted mass murderer who perpetrated the 2012 Aurora theater shooting in which he killed 12 people and injured 70 others (62 directly and eight indirectly) at a Century 16 movie theater on July 20, 2012. He had no known criminal background before the shooting occurred.

Yvan Keller (13 December 1960 – 22 September 2006), nicknamed The Pillow Killer, was a French serial killer. Between 1989 and 2006, he killed at least 23 people in France, Switzerland, and Germany, and confessed to killing about 150.

Akira Nishiguchi (西口 彰, Nishiguchi Akira; December 14, 1925 – December 11, 1970) was a Japanese serial killer and fraudster who murdered five people in late 1963. The focus of a national manhunt, Nishiguchi's crime spree came to an end in January 1964 when he was identified by the 10-year-old daughter of a potential victim.

Stephen Wade (14 December 1887 – 22 December 1956) was one of England's executioners from 1940 until 1955. He assisted Tom and Albert Pierrepoint on 31 occasions and also carried out 28 executions as principal executioner.

Steven John Grieveson (born 14 December 1970) is a British serial killer known as the Sunderland Strangler, who murdered four teenage boys in a series of killings committed between 1990 and 1994 in Sunderland, England. Convicted of three counts of murder at Leeds Crown Court, Grieveson was handed three life sentences on 28 February 1996, with a recommendation that he serve a minimum of 35 years before the Home Secretary considers his eligibility for release.

Frank John Cullotta (December 14, 1938 – August 20, 2020) was an American mobster who was an associate of the Chicago Outfit through Tony Spilotro and a member of the Hole in the Wall Gang burglary ring in Las Vegas. After his arrest in 1982, he became a government witness and entered the witness protection program.

Huang Jinrong (Chinese: 黃金榮; Wade–Giles: Hwang Chin-jung; 10 May 1868 – 20 June 1953), nicknamed "Pockmarked" due to a bad case of smallpox, was a Chinese chief detective who worked for the French Concession police force in Shanghai from 1892 to 1925. Even though he was a detective, he was also one of three major Green Gang bosses along with Du Yuesheng and Zhang Xiaolin in Shanghai.

Jake Bird (December 14, 1901 – July 15, 1949) was an American serial killer who was executed in Washington for the 1947 murders of two women in Tacoma. He is also known to have murdered at least eleven other people across several states between 1930 and 1947.

Álvaro Julio Federico Corbalán Castilla (born 14 December 1951 in Santiago, Chile) is a retired Chilean major general and convicted murderer who belonged to the National Information Center (Central Nacional de Informaciones, CNI), an organization associated with political repression and torture during the military dictatorship in Chile, led by Augusto Pinochet between 1973 and 1990. He is currently serving a sentence for violation of human rights in the Punta Peuco Prison.

Seweryn Antonowicz Kłosowski (14 December 1865 – 7 April 1903), better known under his pseudonym George Chapman, was a Victorian-era Anglo-Polish serial killer known as the Borough Poisoner.

Colonel Thomas Handasyd Perkins, also known as T. H.

Carlton Michael Gary (September 24, 1950 – March 15, 2018) was an American serial killer who murdered three elderly women in Columbus, Georgia, and one in Syracuse, New York, between 1975 and 1978, though he is suspected of at least four more killings. Gary was arrested in December 1978 for an armed robbery and sentenced to 21 years in prison.

Arnoldo Rueda Medina (born 15 December 1969) is a former Mexican drug lord and high-ranking leader of La Familia Michoacana, a drug trafficking organization which is based in Michoacán, Mexico.

Renato Beluche (15 December 1780 – 4 October 1860) was a Louisiana-born Venezuelan merchant, pirate and privateer active in the early nineteenth century Gulf Coast. Born in New Orleans, Spanish Louisiana, to a French smuggler, Beluche went to sea as a pilot's mate in 1802 on board a Spanish Navy warship.

Nero Claudius Caesar Augustus Germanicus ( NEER-oh; born Lucius Domitius Ahenobarbus; 15 December AD 37 – 9 June AD 68) was a Roman emperor and the final emperor of the Julio-Claudian dynasty, reigning from AD 54 until his suicide in AD 68.

Jacobus Dirk (Koos) Hertogs (The Hague, 16 December 1949 – 's-Hertogenbosch, 19 July 2015) was a convicted Dutch serial killer. He was convicted of a total of three murders.

Ciro Annunchiarico (in Italian: Ciro Annicchiarico) (also known as: Papa Ciro) (16 December 1775 in Grottaglie – 8 February 1817 in Francavilla Fontana) was an Italian cult leader.

Jules-Henri Desfourneaux (French pronunciation: [ʒyl ɑ̃ʁi defuʁno]; 17 December 1877 – 1 October 1951) was a French executioner who served as the 5th Monsieur de Paris from 1939 until 1951. He was the last executioner to officiate in public.

Raymond Martinez Fernandez (December 17, 1914 – March 8, 1951) and Martha Jule Beck (May 6, 1920 – March 8, 1951) were an American serial killer couple. They were convicted of one murder, are known to have committed two more, and were suspected of having killed up to twenty victims during a spree between 1947 and 1949.

Yevgeny Nikolaevich Petrov (Russian: Евге́ний Никола́евич Петро́в; born 17 December 1975), known as The Novouralsk Ripper (Russian: Новоуральский потрошитель), is a Russian serial killer, rapist and pedophile.

Amirhossein Pourjafar (also stylised as Amir Hossein Pourjafar, 17 December 1999 – 4 January 2018) was an Iranian juvenile offender who was sentenced to death and executed for the 2016 rape and murder of Setayesh Ghoreyshi, a 7-year-old girl from Iran's Afghan community. Pourjafar was 16 years old at the time of the murder and was executed shortly after his 18th birthday.

Ewa Paradies (17 December 1920 – 4 July 1946) was a Nazi concentration camp overseer.

Ondrej Rigo (17 December 1955 – 14 June 2022) was a Slovak serial killer and necrophile who targeted women in Bratislava, Munich and Amsterdam from 1990 to 1992. He served a life sentence until his death for nine murders and one attempted murder in Leopoldov Prison in Slovakia.

Linda Laura Hazzard (née Burfield; December 18, 1867 – June 24, 1938), nicknamed the "Starvation Doctor", was an American quack, swindler, and convicted serial killer noted for her promotion of fasting, pummeling and hours-long enemas as treatments. In 1911, Hazzard was found guilty of manslaughter in the state of Washington and was sentenced to 2 to 20 years of hard labor for killing at least 15 people for financial gain at a sanitarium she operated on the Kitsap Peninsula in the early 20th century.

Owen Vincent "Owney" Madden (December 18, 1891 – April 24, 1965) was an English-American gangster who was a leading underworld figure in New York during Prohibition. Nicknamed "The Killer", he garnered a brutal reputation within street gangs and organized crime.

Karol Kot (18 December 1946 – 16 May 1968) was a Polish murderer who terrorized the city of Kraków between 1964 and 1966. Due to trial evidence and to the seemingly random choices of victims, which included children and elderly people, Kot was nicknamed the Vampire of Kraków (Polish: Wampir z Krakowa).

Edmund Emil Kemper III (born December 18, 1948) is an American serial killer convicted of murdering seven women, including his own mother, and one girl between May 1972 and April 1973. Years earlier, at the age of 15, Kemper had murdered his paternal grandparents.

Joseph Vissarionovich Stalin (né Dzhugashvili; 18 December [O.S. 6 December] 1878 – 5 March 1953) was a Soviet revolutionary and politician who led the Soviet Union from 1924 until his death in 1953.

Louis Darquier (19 December 1897 – 29 August 1980), better known under his assumed name Louis Darquier de Pellepoix, was Commissioner-General for Jewish Affairs under the Vichy Régime.

Raffaele Cutolo (Italian: [raffaˈɛːle ˈkuːtolo]; 4 November 1941 – 17 February 2021) was an Italian crime boss and leader of the Nuova Camorra Organizzata (NCO), an organisation he built to renew the Camorra. Cutolo had a variety of nicknames including 'o Vangelo ("the gospel"), 'o Princepe ("the prince"), 'o Professore ("the professor") and 'o Monaco ("the monk").

Ramón Gustavo Castillo Gaete (20 December 1977 – 1 May 2013) was a Chilean murderer and leader of a doomsday-oriented religious sect stationed in Colliguay, a rural area in the Valparaíso Region, where he claimed to be the second coming of Jesus and was known as "Antares de la Luz" (from Spanish, "Antares of the Light").

Timofey Mikhailovich Podshivalov (Russian: Тимофей Михайлович Подшивалов; born 20 December 1991), known as The Zakamsky Maniac (Russian: Закамский маньяк), is a Russian serial killer who operated in Perm in 2011. He is considered one the worst killers in the history of Perm, although his exact motives remain unknown.

Nicolau Pereira de Campos Vergueiro, better known as Senator Vergueiro (Portuguese: Senador Vergueiro; 20 December 1778 – 17 September 1859), was a Portuguese-born Brazilian coffee farmer and politician and slave trader. He was a pioneer in the implementation of a free workforce, as opposed to slavery, in Brazil by bringing the first European immigrants to work in the Ibicaba farm, which he owned.

Alexey Vladimirovich Ryzhkov (Russian:Алексей Владимирович Рыжков; born 20 December 1972), known as the Rubtsovsk Ripper, is a Russian serial killer who raped and murdered four women and a teenage girl in Rubtsovsk, Russia, between 2000 and 2001. He was caught by police shortly after murdering his last victim, and subsequently sentenced to life imprisonment.

Pierre François Lacenaire (20 December 1803 – 9 January 1836) was a French murderer and poet.

James Michael Coonan (born December 21, 1946) is an Irish-American mobster and racketeer from Manhattan, New York who served as the boss of the Westies gang, an Irish mob group based in Hell's Kitchen, from approximately 1977 to 1988. Coonan was incarcerated and began serving a 75-year prison term in 1988.

Oleg Viktorovich Rylkov (Russian: Оле́г Викторович Рылько́в; born 21 December 1966), known as the Tolyatti Ripper (Russian: Тольяттинский потрошитель, romanized: Tolyattinsky potroshitel), is a Russian serial killer, rapist and pedophile. Between 1992 and 1997, he raped 37 (some sources say 39) underage girls and killed 12 people in the city of Tolyatti, in the Samara Oblast.

Larry William Eyler (December 21, 1952 – March 6, 1994), also called the Interstate Killer and the Highway Killer, was an American serial killer who murdered a minimum of twenty-one teenage boys and young men in the Midwest between 1982 and 1984. His victims were all discovered in locations close to or accessible via the Interstate Highway System in the states of Indiana and Illinois.

Paolo Rosario De Stefano (Italian pronunciation: [ˈpaːolo roˈzaːrjo de ˈsteːfano]; born December 21, 1976, in Melito di Porto Salvo) is an Italian mobster and member of the 'Ndrangheta. He has been a fugitive since 2005 and was included on the list of most wanted fugitives in Italy.

Peter John Milano (December 22, 1925 – April 21, 2012) was a Los Angeles-based, American mobster, and former boss of the Los Angeles crime family. Milano was active in organized crime from the 1950s until his death.

Scott Thomas Erskine (December 22, 1962 – July 3, 2020) was an American serial killer on California's death row, convicted in 2003 for the 1993 murder of two California boys. He was incarcerated at San Quentin State Prison.

Nikolai Arkadievich Dudin (Russian: Никола́й Арка́дьевич Ду́дин; born 22 December 1973), known as The Grim Maniac (Russian: Обидчивый маньяк), is a Soviet-Russian serial killer who killed 13 people in the town of Furmanov between 1987 and 2002.

Rafael "Ranko" Boban (22 December 1907 – disappearance in 1945) was a Croatian military commander who served in the Ustaše Militia and Croatian Armed Forces during World War II. Having participated in the Velebit uprising in 1932, he joined the Royal Italian Army and returned to Croatia following the Axis invasion of Yugoslavia in April 1941.

José Victoriano Huerta Márquez (Spanish pronunciation: [biɣtoˈɾjano ˈweɾta]; 23 December 1850 – 13 January 1916) was a Mexican general, statesman, engineer, and dictator who served as the 39th President of Mexico from 1913 to 1914 and came to power by coup against the democratically elected government of Francisco I. Madero with the aid of other Mexican generals and the U.S.

William Edward Cook Jr. (December 23, 1928 – December 12, 1952) was an American spree killer and mass murderer who murdered six people, including a family of five, on a 22-day rampage between Missouri and California in 1950–51.

Antonio Boggia (23 December 1799 – 8 April 1862), aka "Il Mostro di Stretta Bagnera" (The Monster of Bagnera lane) or "Il Mostro di Milano" (The Monster of Milan), is considered the first serial killer of Italy.

Charles Chi-tat Ng (born Ng Chi-tat) (Chinese: 吳志達; born 24 December 1960) is a Hong Kong-born convicted serial killer who committed numerous crimes in the United States. He is believed to have raped, tortured, and murdered between eleven and twenty-five victims with his accomplice Leonard Lake at Lake's cabin in Calaveras County, California, 60 miles (96 km) from Sacramento, between 1983 and 1985.

Lydia Sherman (December 24, 1824 – May 16, 1878), née Danbury, also known as The Derby Poisoner, was an American serial killer. She poisoned eight children in her care (six of whom were her own) and her three husbands and was convicted of second-degree murder in 1872.

The Bradford murders were the serial killings of three women in the city of Bradford, West Yorkshire, England in 2009 and 2010.

Giuseppe Farinella (24 December 1925 – 5 September 2017) was a Sicilian mafioso, boss of the San Mauro Castelverde family and a one-time member of the Sicilian Mafia Commission.