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Proof was a part of the Goon Sqwad, a group of Detroit rappers. The group was formed in the early 1990s and released its first album, "Goon Sqwad", in 1994. The group was known for its aggressive style of rap, and Proof was one of the most popular members. The group disbanded in 1998, but Proof continued to release solo albums. He was shot and killed in 2006.