After a dispute with Eazy-E , Dre left the group at the peak of its popularity in 1991 under the advice of friend , and N.W.A lyricist , The D.O.C. and his bodyguard at the time , Suge Knight .
After an argument with Eazy-E over money , Dre left the group in 1991 under the advice of a friend , The D.O.C. and his bodyguard at the time , Suge Knight .