ont ▁McK en na ▁College ▁and ▁her ▁mother ▁worked ▁at ▁Az usa ▁Pacific ▁University . ▁She ▁has ▁two ▁brothers . ▁In ▁ 1 9 9 1 , ▁after ▁Ros sum ' s ▁father ▁accepted ▁the ▁position ▁of ▁President ▁of ▁H amp den – S yd ney ▁College , ▁the ▁family ▁moved ▁to ▁Virginia ▁and ▁Krist in ▁en rolled ▁at ▁the ▁all - g irls ▁St . ▁Catherine ' s ▁School ▁in ▁Richmond . ▁There , ▁Ros sum ▁began ▁drink ing ▁be er ▁and ▁sm oking ▁c igare tt es . ▁She ▁also ▁tried ▁mar iju ana , ▁but ▁said ▁it ▁had ▁little ▁effect .. ▁Starting ▁in ▁ 1 9 9 2 , ▁she ▁began ▁using ▁m eth am ph et am ine . ▁ ▁In ▁ 1 9 9 4 , ▁Ros sum ▁moved ▁back ▁to ▁California ▁and ▁en rolled ▁part - time ▁at ▁the ▁University ▁of ▁Red lands ▁and ▁moved ▁into ▁a ▁d orm itory ▁on ▁campus , ▁but ▁eventually ▁left ▁following ▁a ▁re lapse . ▁After ▁over coming ▁her ▁add iction ▁and ▁beginning ▁her ▁relationship ▁with ▁Greg ▁de ▁Vill ers , ▁Ros sum ▁en rolled ▁at ▁San ▁Diego ▁State ▁University ▁and ▁graduated ▁with ▁hon ors ▁in ▁ 1 9 9 8 . ▁After ▁gradu ating , ▁she ▁worked ▁as ▁a ▁to xic ologist ▁at ▁the ▁San ▁Diego ▁County ▁medical ▁exam iner ' s ▁office . ▁Ros sum ▁and ▁de ▁Vill ers ▁married ▁in ▁ 1 9 9 9 . ▁The ▁following ▁year , ▁she ▁began ▁an ▁extr amar ital ▁affair ▁with