List of Famous people who died at 21

Jarad Anthony Higgins, known professionally as Juice Wrld, was an American rapper, singer, and songwriter from Chicago, Illinois. His song "Lucid Dreams" has been played on the music streaming platform Spotify over one billion times and peaked at number two on the Billboard Hot 100. "Lucid Dreams", along with his earlier hit single "All Girls Are the Same", helped him secure a recording contract with Lil Bibby's Grade A Productions and Interscope Records. He derived his stage name from late rapper Tupac Shakur and his part in the film Juice and that it represents taking over the world.

Gustav Elijah Åhr, known professionally as Lil Peep, was an American rapper, singer, songwriter and model. He was a member of the emo rap collective GothBoiClique. Helping pioneer an emo revival style of rap and rock music, Lil Peep has been credited as the leading figure of the mid–late 2010s emo rap scene and came to be an inspiration to outcasts and youth subcultures.

Matthew Adam Garber was a British child actor who played Michael Banks in the 1964 film Mary Poppins. He appeared in only two other films, The Three Lives of Thomasina and The Gnome-Mobile, all three times appearing alongside actress Karen Dotrice. All three appearances were in movies by Walt Disney Pictures.

Matthew Wayne Shepard was a gay American student at the University of Wyoming who was beaten, tortured, and left to die near Laramie on the night of October 6, 1998. He was taken by rescuers to Poudre Valley Hospital in Fort Collins, Colorado, where he died from severe head injuries six days later.

Simon John Ritchie, known professionally as Sid Vicious, was an English bassist and vocalist for the Sex Pistols, a British punk rock band. Vicious replaced Glen Matlock, who had fallen out of favour with the other members of the group.

Rebecca Lucile Schaeffer was an American model and actress. She began her career as a teen model before moving on to acting. In 1986, she landed the role of Patricia "Patti" Russell in the CBS comedy My Sister Sam. The series was canceled in 1988, and Schaeffer appeared in several films, including the black comedy Scenes from the Class Struggle in Beverly Hills. At the age of 21, Schaeffer was shot and killed by Robert John Bardo, an obsessed fan who had been stalking her.

Burhan Muzaffar Wani was a commander of the militant organisation Hizbul Mujahideen, active in Kashmir. He wielded massive popularity among the local populace through social media presence, and helped in conveying a more youth-oriented image of militancy in Kashmir, recruiting numerous foot-soldiers to the cause.

Alexis Alijai Lynch, better known by her stage name Lexii Alijai, was an American rapper.

Saeed Abdallah Ali Sulayman al-Ghamdi was one of four hijackers of United Airlines Flight 93 as part of the September 11 attacks.

Dan Kaminsky was an American security researcher. He was a Co-Founder and Chief Scientist of White Ops, a firm specializing in detecting malware activity via JavaScript. He has worked for Cisco, Avaya, and IOActive, where he was the Director of Penetration Testing. He is known among computer security experts for his work on DNS cache poisoning, for showing that the Sony Rootkit had infected at least 568,000 computers, and for his talks at the Black Hat Briefings.