April 4, 1991

1991Yui Koike, Japanese singer and actress^[†]

Yui Koike is a Japanese actress and former gravure idol. She is known for her role as Ahim de Famille/Gokai Pink in the 2011 Super Sentai series Kaizoku Sentai Gokaiger. She was a member of the idol group Tomato n'Pine. She is currently affiliated with Weeds Company.

1991Asia Muhammad, American tennis player^[†]

Asia Muhammad is an American professional tennis player who specializes in doubles. She has been ranked as high as world No. 8 in doubles by the WTA, achieved on March 17, 2025. Muhammad has won 13 doubles titles on the WTA Tour including the 2024 Cincinnati WTA 1000 title with Erin Routliffe and the 2025 Indian Wells with Demi Schuurs.

1991Justin O'Neill, Australian rugby league player^[†]

Justin O'Neill is an Australian former professional rugby league footballer who played for the Melbourne Storm and North Queensland Cowboys in the NRL and Australia at international level.

1991Martín Pérez, Venezuelan baseball player^[†]

Martín Pérez Jiménez is a Venezuelan professional baseball pitcher for the Chicago White Sox of Major League Baseball (MLB). He has previously played in MLB for the Minnesota Twins, Boston Red Sox, Texas Rangers, Pittsburgh Pirates, and San Diego Padres. Pérez was an MLB All-Star in 2022 and won the 2023 World Series with the Rangers.

1991Jamie Lynn Spears, American actress and singer^[†]

Jamie Lynn Marie Spears is an American actress and singer. Spears began her career as a child actress on All That and had her breakthrough role when she played Zoey Brooks on the Nickelodeon teen sitcom Zoey 101 (2005–2008); she later reprised this role in the sequel film Zoey 102 (2023). She plays Noreen Fitzgibbons on the Netflix romantic drama series Sweet Magnolias (2020–present). She is the recipient of several accolades, including a Gracie Award, two Kids Choice Awards and two Young Artist Awards. She is the younger sister of singer Britney Spears.

1991Marlon Stöckinger, Filipino race car driver^[†]

Marlon Alexander Stöckinger is a Filipino and Swiss former racing driver competing under the Philippine flag. He most recently competed in the 2016 GT Series Sprint Cup for ISR Racing. He raced for Status Grand Prix in the 2015 GP2 Series and 2012 GP3 Series, and for Lotus in the Formula Renault 3.5 Series from 2013 to 2015. He is the first Filipino to win a formula race in Europe, winning race 9 of the 2010 Formula Renault 2.0 UK Championship at the Croft Circuit on 19 June of that year.

1991Edmund Adamkiewicz, German footballer (born 1920)^[†]

Edmund "Adam" Adamkiewicz was a German footballer.

1991Max Frisch, Swiss playwright and novelist (born 1911)^[†]

Max Rudolf Frisch was a Swiss playwright and novelist. Frisch's works focused on problems of identity, individuality, responsibility, morality, and political commitment. The use of irony is a significant feature of his post-war output. Frisch was one of the founders of Gruppe Olten. He was awarded the 1965 Jerusalem Prize, the 1973 Grand Schiller Prize, and the 1986 Neustadt International Prize for Literature.

1991H. John Heinz III, American soldier and politician (born 1938)^[†]

Henry John Heinz III was an American businessman and politician who served as a United States senator from Pennsylvania from 1977 until his death in 1991. An heir to the Heinz family fortune, Heinz entered politics in 1971 when he won a special election to replace Robert Corbett to represent Pennsylvania's 18th congressional district. In 1976, Heinz ran to replace retiring Senate Minority Leader Hugh Scott. Heinz narrowly won in the Republican primary over future Senator Arlen Specter and defeated William Green III in the general election. Heinz won re-election in 1982 and 1988 by large margins. On April 4, 1991, Heinz was killed when his plane, facing mechanical problems, collided with a helicopter inspecting the plane, killing all involved in the crash.

1991Graham Ingels, American illustrator (born 1915)^[†]

Graham John Ingels was a comic book and magazine illustrator best known for his work in EC Comics during the 1950s, notably on The Haunt of Fear and Tales from the Crypt, horror titles written and edited by Al Feldstein, and The Vault of Horror, written and edited by Feldstein and Johnny Craig. Ingels' flair for horror led EC to promote him as Ghastly Graham Ingels, and he began signing his work "Ghastly" in 1952.

1991Senator John Heinz of Pennsylvania and six others are killed when a helicopter collides with their airplane over an elementary school in Merion, Pennsylvania.^[†]

Henry John Heinz III was an American businessman and politician who served as a United States senator from Pennsylvania from 1977 until his death in 1991. An heir to the Heinz family fortune, Heinz entered politics in 1971 when he won a special election to replace Robert Corbett to represent Pennsylvania's 18th congressional district. In 1976, Heinz ran to replace retiring Senate Minority Leader Hugh Scott. Heinz narrowly won in the Republican primary over future Senator Arlen Specter and defeated William Green III in the general election. Heinz won re-election in 1982 and 1988 by large margins. On April 4, 1991, Heinz was killed when his plane, facing mechanical problems, collided with a helicopter inspecting the plane, killing all involved in the crash.

1991Forty-one people are taken hostage inside a Good Guys! Electronics store in Sacramento, California. Three of the hostage takers and three hostages are killed.^[†]

On April 4, 1991, 41 employees and customers were taken hostage by four gunmen and held at a Good Guys! electronics store at the corner of 65th Street and Stockton Boulevard in Sacramento, California, near Florin Mall for approximately eight hours. Near the end of the hostage crisis, six were killed: three hostages and three of the four hostage-takers. The fourth hostage-taker was captured by authorities, and an additional 14 hostages were injured during the crisis. To this day, the hostage crisis remains the largest hostage rescue operation in US history, with over 40 hostages having been held at gunpoint.