Claim: Big DS (1971-2003) was a hardcore hip hop MC who was with JMJ Records (founded by Jam Master J'Son).
Evidence: JMJ Records is an American record label which was founded in 1989 by Jason Mizell, better known as Jam Master Jay from Run-D.M.C.. The label was relaunched in 2017 by Jam Master J'Son, the oldest son of the legendary Jam Master Jay.