Jason William Mizell aka Jam Master Jay, was an American musician and DJ. He was the DJ of the influential hip hop group Run-D.M.C. During the 1980s, Run-D.M.C. became one of the biggest hip-hop groups and are credited with breaking hip-hop into mainstream music.

For his skill re-working riffs from classic guitar records, he was ranked #10 on Spin's list of the "100 Greatest Guitarists of All Time. On October 30, 2002, while recording new music at his studio in the Jamaica district of Queens, New York City, Mizell was shot and killed by an unknown assailant.

He first started playing at parks and later played at bars. He also began throwing small parties around the area. Once he got a pair of Technics 1200s he improved rapidly since he was able to practice at night with headphones on when he was supposed to be sleeping.

Mizell became a DJ because he "just wanted to be a part of the band". Prior to joining Run-D.M.C., he played bass and drums in several garage bands. In 1982, he joined Joseph "Run" Simmons and Darryl "D.M.C." McDaniels just after they graduated from high school and agreed to DJ for them because he wanted to be part of the band. On Run-D.M.C's album Raising Hell, Mizell played keyboards, bass, and live drums in addition to his turntable work. Mizell remained in his childhood neighborhood in Hollis, Queens his entire life.

In 1989, Mizell established Jam Master Jay Records. The label is most known for signing 50 Cent and Onyx. Jam Master Jay Records folded after Jason Mizell was murdered on October 30, 2002. The crime has yet to be solved.

Mizell's legacy includes the Scratch DJ Academy in Manhattan. Founded in 2002, the year of his death, the academy was created to "provide unparalleled education and access to the art form of the DJ and producer."

On October 30, 2002, at 7:30 pm, an unknown person fatally shot Mizell in a Merrick Boulevard recording studio in Jamaica, Queens. The other person in the room, 25-year-old Mike, was shot in the ankle but survived. Following his death, several artists expressed their grief for the loss in the hip hop community and remembered him for his influence on music and the genre. Mizell was buried at Ferncliff Cemetery and Mausoleum in Hartsdale, New York.

In 2003, Kenneth McGriff, a convicted drug dealer and longtime friend of Murder Inc. founders Irving "Irv Gotti" Lorenzo and his older brother Christopher, was investigated for targeting Mizell because the DJ defied an industry blacklist of rapper 50 Cent that was imposed because of "Ghetto Qu'ran", a song 50 Cent wrote about McGriff's drug history.

In April 2007, federal prosecutors named Ronald Washington as an accomplice in the murder. Washington also is a suspect in the 1995 murder of Vince "Stretch" Walker, a former close associate of the late rapper Tupac Shakur, who was also murdered. According to court papers filed by the prosecution, Washington "pointed his gun at those present in the studio, ordered them to get on the ground and provided cover for his associate to shoot and kill Jason Mizell." However, he was never convicted, no new suspects have been named, and Mizell's murder remains unsolved.

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