Short answers, pulled from the story.
MF Doom's real name was Daniel Dumile, born Dumile Daniel Thompson on the 13th of July 1971, in Hounslow, London. He was a British and American rapper, songwriter, and record producer known for intricate wordplay, a signature metal mask, and a supervillain stage persona.
Madvillainy is a 2004 album recorded by MF Doom and producer Madlib under the group name Madvillain, released on the 23rd of March 2004. It was a critical and commercial success and is widely regarded as Dumile's magnum opus and a landmark in avant-garde hip hop. After Dumile's death, Flying Lotus wrote that it was "all u ever needed in hip-hop".
Dumile had lived in the United States since infancy on a non-immigrant B visa and never naturalized as a U.S. citizen. After completing a European tour in 2010, the Department of Homeland Security denied him re-entry and found him "unlawfully present", forcing him to return to England. His family relocated to London in 2012.
Dumile died on the 31st of October 2020, at St James's University Hospital in Leeds from angioedema, an adverse reaction to blood pressure medication he had recently been prescribed. His death was not announced publicly until the 31st of December 2020, by his wife Jasmine, and the cause was not revealed until July 2023.
Dumile created the mask as the centerpiece of the MF Doom alter ego, combining elements from the Marvel Comics supervillain Doctor Doom, Destro, and the Phantom of the Opera. He began wearing it at open-mic events in the late 1990s after years away from hip hop following his brother's death. Academic Hershini Bhana Young argued the mask positioned him as an enemy of dominant constructions of identity.
DJ Subroc, Dumile's younger brother and KMD bandmate, was struck by a car and killed while crossing the Long Island Expressway on the 23rd of April 1993. He was 19 years old. His death prompted Dumile to withdraw from hip hop for several years before returning with the MF Doom persona.