Dong Zhuo () (c. 140s – 22 May 192), courtesy name Zhongying, was a Chinese military general, politician, and warlord who lived in the late Eastern Han dynasty.

Francesco Mallardo (Italian pronunciation: [franˈtʃesko malˈlardo]; 1 April 1951 – 29 May 2025), also known as Ciccio 'e Carlantonio, was an Italian criminal and a member of the Neapolitan Camorra. He headed the Mallardo clan operating from the town of Giugliano in Campania, north of the city of Naples.

Charles Augustus Lafayette Lamar (April 1, 1824 – April 16, 1865) was an American businessman from Savannah, Georgia, best known for his leadership in an investment ring to illegally import slaves from Africa on the ship Wanderer in 1858. The ship ran blockades and brought 409 surviving Africans from the Congo to the United States for sale.

Renaud Hardy (born 1 April 1962), known as The Parkinson's Murderer, is a Belgian serial killer who was sentenced to life imprisonment for murder, rape and attempted murder in 2018.

Alexander Vladimirovich Bychkov (Russian: Александр Владимирович Бычков; born 1 April 1988) is a Russian serial killer and cannibal convicted for the murder of nine men in Belinsky, Penza Oblast between 2009 and 2012.

Robert Leslie Stewart (April 1918 – 30 April 1988), from Edinburgh, Scotland, was one of the last executioners in the United Kingdom, officiating between 1950 and 1964.

Scott Douglas Lively (born December 14, 1957) is an American activist, author, and attorney, who is the president of Abiding Truth Ministries, an anti-LGBTQ group based in Temecula, California. He was also a cofounder of Latvia-based group Watchmen on the Walls, state director of the California branch of the American Family Association, and a spokesman for the Oregon Citizens Alliance.

Leslie "Mad Dog" Irvin (April 2, 1924 – November 9, 1983) was an American serial killer whose killing spree in the early 1950s terrorized residents of southwestern Indiana and whose Supreme Court case set a precedent for ensuring a fair trial for defendants even in the wake of a great deal of pretrial publicity.

On July 29, 1999, a shooting spree occurred at two Atlanta-area day trading firms, Momentum Securities and the All-Tech Investment Group. Nine people were killed, and 13 other people were injured.

Dante "Tex" Gill (died January 8, 2003) was an American transmasculine gangster, pimp and massage parlor owner.

Giacomo Girolamo Casanova (; Italian: [ˈdʒaːkomo dʒiˈrɔːlamo kazaˈnɔːva, kasa-]; 2 April 1725 – 4 June 1798) was an Italian adventurer and writer who was born in the Republic of Venice and travelled extensively throughout Europe. He is chiefly remembered for his autobiography, written in French and published posthumously as Histoire de ma vie ("The Story of My Life").

John Demjanjuk (born Ivan Mykolaiovych Demjanjuk 3 April 1920 – 17 March 2012), was a Trawniki and Nazi camp guard at Sobibor extermination camp, Majdanek, and Flossenbürg. Demjanjuk became the center of global media attention in the 1980s, when he was tried and convicted in Israel after being identified as "Ivan the Terrible", a notoriously cruel watchman at Treblinka extermination camp.

Gennady Grigorievich Serebrennikov (Russian: Геннадий Григорьевич Серебренников; born 3 April 1958) is a Russian serial killer and former major of the Ministry of Internal Affairs, who killed 5 witnesses related to his son's 2003 trial.

Vinko Pintarić (3 April 1941 – 25 May 1991) was a Croatian serial killer and outlaw who murdered five people over the course of 17 years and escaped from prisons and police stakeouts on multiple occasions. His violent, vindictive nature and proficiency with firearms struck fear into inhabitants of Hrvatsko Zagorje, a region of northern Croatia where he spent years at large, hiding from law enforcement and engaging in various crimes, until his 1991 death in a shootout with the police.

Dylann Storm Roof (born April 3, 1994) is an American mass murderer, white supremacist, and neo-Nazi who perpetrated the Charleston church shooting. During a Bible study on June 17, 2015, at Emanuel African Methodist Episcopal Church in Charleston, South Carolina, Roof murdered nine people and injured a tenth, all African Americans, including senior pastor and state senator Clementa C.

Bruno Lüdke (3 April 1908 – 8 April 1944) was a German alleged serial killer. Police officials connected him to at least 51 murder victims, mainly women, killed in a 15-year period, which began in 1928 and ended with his arrest in 1943.

Roberto Succo (3 April 1962 – 23 May 1988) was an Italian serial killer who committed several murders and other violent crimes mostly in Italy and France in the 1980s.

The Cleveland Elementary School shooting took place on January 29, 1979, at Grover Cleveland Elementary School in San Diego, California, United States. The principal and a custodian were killed; eight children and a police officer were injured.

In May 2012, Jun Lin (Chinese: 林俊; pinyin: Lín Jùn; December 30, 1978 – May 24 or 25, 2012), a Chinese university student, was fatally stabbed and dismembered in Montreal, Canada, by Luka Rocco Magnotta, who then mailed Lin's hands and feet to elementary schools and federal political party offices. After a video that showed Magnotta mutilating Lin's corpse was posted online, Magnotta fled Canada, becoming the subject of an Interpol Red Notice and prompting an international manhunt.

Joaquín Archivaldo Guzmán Loera (Spanish: [xoaˈkin aɾtʃiˈβaldo ɣusˈman loˈeɾa]; born 4 April 1957), commonly known as "El Chapo" ([el ˈt͡ʃapo]), is a Mexican former drug lord and the former top leader of the Sinaloa Cartel. Guzmán is believed to be responsible for the deaths of over 34,000 people, and was considered to be the most powerful drug trafficker in the world until he was extradited to the United States and sentenced to life in prison.

Judias Anna Lou "Judy" Buenoano (born Judias Welty, also known as Judias Goodyear and Judias Morris; April 4, 1943 – March 30, 1998) was an American serial killer who was executed in Florida for the 1971 murder of her first husband James Goodyear. She was also convicted of the 1980 murder of her son, Michael Buenoano, and the 1983 attempted murder of her boyfriend, John Gentry.

Michel Paul Fourniret (4 April 1942 – 10 May 2021) was a French serial killer who confessed to killing 12 people in France and Belgium between 1987 and 2003. After he was arrested in June 2003 for the attempted kidnapping of a teenage girl in Ciney, Fourniret confessed in 2004 to killing nine people, eight females and one male, having been informed on by his then-wife, Monique Pierrette Olivier (born 31 October 1948).

Dorothea Helen Puente (née Gray; January 9, 1929 – March 27, 2011), also known as the Killer Landlady or the Death House Landlady, was an American serial killer and financial fraudster who murdered various tenants of the boarding house she ran in Sacramento, California, between 1982 and 1988.

David Edward Maust (April 5, 1954 – January 20, 2006) was an American serial killer who targeted predominantly male teenagers. His murders occurred in Germany and the United States.

Elihu Yale (5 April 1649 – 8 July 1721) was a British-American colonial administrator.

Avraham Tehomi (Hebrew: אברהם תהומי, also Avraham T'homi, 1903–1991) was a militant who served as a Haganah commander, and was one of the founders and first commander of the Irgun. He is best known for the assassination of Jacob Israël de Haan.

Saeed Hanaei or Said Hanai (Persian: سعید حنایی; 1962 – April 17, 2002) was an Iranian serial killer, arrested in 2001 for the murders of at least 16 women in Mashhad. Hanaei was referred to as the "Spider Killer" for the way he lured his victims, mainly prostitutes, back to his home before strangling them.

Count Pál János Ede Teleki de Szék (1 November 1879 – 3 April 1941) was a Hungarian politician who served as Prime Minister of the Kingdom of Hungary from 1920 to 1921 and from 1939 to 1941. He was also an expert in geography, a university professor, a member of the Hungarian Academy of Sciences, and chief scout of the Hungarian Scout Association.

Salvatore Scaglione (10 April 1940 in Palermo – 30 November 1982 in San Giuseppe Jato) was a member of the Sicilian Mafia. He was the boss of the Noce, a neighborhood in central Palermo, since the early 1970s.

Vladimir Vasilievich Krishtopa (Russian: Влади́мир Васи́льевич Кришто́па; born 6 April 1973) is a Ukrainian-born Russian murderer and rapist.

Horst Ludwig Georg Erich Wessel (9 October 1907 – 23 February 1930) was a member of the Sturmabteilung (SA), the paramilitary wing of the Nazi Party, who became a propaganda symbol in Nazi Germany following his murder in 1930 by two members of the Communist Party of Germany (KPD). After his death, Nazi Propaganda Minister Joseph Goebbels elevated him into a martyr for the Nazi Party.

Gennady Modestovich Mikhasevich (Belarusian: Генадзь Мадэставіч Міхасевіч; 7 April 1947 – 25 September 1987) was a Soviet serial killer and serial rapist known as the "Vitebsk Strangler" (Віцебскі душыцель), who murdered a minimum of 36 women in Vitebsk, Polotsk and the surrounding regions in the Byelorussian SSR between 1971 and 1985.

Cheung Tze-keung ((1955-04-07)7 April 1955 – (1998-12-05)5 December 1998) was a notorious Hong Kong gangster also known as "Big Spender" (Chinese: 大富豪; Jyutping: daai6 fu3 hou4; pinyin: dà fùháo). He was a kidnapper, robber, arms smuggler and was wanted for murder.

Abdufatto Tashpulatovich Zamanov (Russian: Абдуфатто́ Ташпула́тович Зама́нов; born 7 April 1973), known as The Krasnoyarsk Chikatilo (Russian: Красноярский Чикатило), is a Tajik-born Russian serial killer. Between June 2002 and November 2004, he killed nine men and five women in Krasnoyarsk and its suburbs on the basis of personal hostility, also raped two girls aged between 12 and 16.

Jozef Slovák (born 1951) is a Slovak serial killer who murdered at least five women in Slovakia and the Czech Republic from 1978 to 1991 between the ages of 16 and 21. He is currently serving a life sentence for four murders in Ilava Prison in Slovakia.

Herbert Richard Baumeister (April 7, 1947 – July 3, 1996) was a German-American businessman and serial killer who came under suspicion of murdering over a dozen men in the early-to-mid 1990s, most of whom were last seen at gay bars in central Indiana. Police ultimately found the remains of eleven men, eight identified, on Baumeister's property.

William Laws Calley Jr. (June 8, 1943 – April 28, 2024) was a United States Army officer and war criminal, convicted by court-martial of the murder of 22 unarmed South Vietnamese civilians in the My Lai massacre on March 16, 1968, during the Vietnam War.

John Reginald Halliday Christie (8 April 1899 – 15 July 1953) was an English serial killer and serial rapist active during the 1940s and early 1950s. He murdered at least eight people—including his wife Ethel—by strangling them inside his flat at 10 Rillington Place, Notting Hill, London.

Timur (1320s – 17/18 February 1405), also known as Tamerlane, was a Turco-Mongol conqueror, first ruler of the Timurid dynasty, and the founder of the Timurid Empire, which ruled over modern-day Afghanistan, Iran, and Central Asia. He was undefeated in battle and is widely regarded as one of the greatest military leaders and tacticians in history, as well as one of the most brutal and deadly.

Fyodor Nikolayevich Kozlov (Russian: Федор Николаевич Козлов; 9 April 1959 – 1 September 1990), known as The Iskitim Maniac (Russian: Искитимский маньяк), was a Soviet serial killer and rapist who committed a series of murders in three oblasts from 1976 to 1989. Convicted and sentenced to death for these crimes, he hanged himself in prison before the verdict could be carried out.

Eric David Harris (April 9, 1981 – April 20, 1999) and Dylan Bennet Klebold ( KLEE-bohld; September 11, 1981 – April 20, 1999) were American high school seniors and a mass murderer duo who perpetrated the massacre at Columbine High School on April 20, 1999, in Columbine, Colorado. Harris and Klebold killed 13 students and one teacher and wounded 23 others.

John Overton (April 9, 1766 – April 12, 1833) was an American planter and slave trader, a judge at the Tennessee Supreme Court, a banker, political leader, and an advisor of Andrew Jackson. He was described in 1889 as having been the "wealthiest man in the State."

Martha Needle (née Charles; 9 April 1863 – 22 October 1894) was an Australian serial killer who was hanged for poisoning her husband, three children, and prospective brother-in-law. She was convicted for the murder of Louis Juncken, brother of her fiancé Otto Juncken, on 15 May 1894.

Stephen Craig Paddock (April 9, 1953 – October 1, 2017) was an American mass murderer who perpetrated the 2017 Las Vegas shooting. Paddock opened fire into a crowd of about 22,000 concertgoers attending a country music festival on the Las Vegas Strip, killing 60 people and injuring approximately 867 (at least 413 of whom were wounded by gunfire).

Leopold II (9 April 1835 – 17 December 1909) was the second king of the Belgians from 1865 to 1909, and the founder and sole owner of the Congo Free State from 1885 to 1908.

James Bowie ( BOO-ee) (April 10, 1796 – March 6, 1836) was an American military officer, landowner and slave trader who played a prominent role in the Texas Revolution. He was among the Americans who died at the Battle of the Alamo.

Karl Eduard Nobiling (10 April 1848 – 10 September 1878) was a German attempted assassin, who in 1878 made an attempt on the life of Emperor Wilhelm I.

Valeriy Nikolayevich Andreev (Russian: Вале́рий Никола́евич Андре́ев; born 10 April 1957), known as the Orsk Maniac (Russian: Орский маньяк, romanized: Orskiy manyak), is a Russian serial killer and rapist responsible for the abductions, rapes and killings of various girls and women in Orenburg Oblast from 2006 to 2012. Investigators have conclusively tied him to at least 7 murders, after which he was put on a wanted list, but managed to escape.

Marshall Herff Applewhite Jr. (May 17, 1931 – March 24, 1997), also known as Do, among other names, was an American religious leader who founded and led the Heaven's Gate new religious movement (often described as a cult), and organized their mass suicide in 1997.

Richard Leonard Kuklinski (: April 11, 1935 – March 5, 2006), also known by his nickname the Iceman, was an American criminal and leader of a New Jersey-based burglary ring. He engaged in criminal activities for most of his adult life, which began when he distributed pirated pornography and eventually escalated to at least five murders committed between 1980 and 1984 for personal profit.