He rejoined in 1985 to record `` Freaky Styley '' and `` The Uplift Mofo Party Plan '' in 1987 . He died in 1988 from a fatal drug overdose . Prior to his death of a heroin overdose in 1988 , Slovak recorded two albums with the band , Freaky Styley ( 1985 ) and The Uplift Mofo Party Plan ( 1987 ) .