▁" in fin ity less ") ▁system ▁of ▁det ention ▁where ▁conv ict s ▁could ▁move ▁freely ▁throughout ▁the ▁col ony . ▁On ▁occasion ▁they ▁could ▁even ▁travel ▁beyond ▁its ▁borders ▁for ▁any ▁administrative ▁needs . ▁Sh ip il ov ▁understood ▁immediately ▁that ▁this ▁could ▁be ▁used ▁for ▁his ▁criminal ▁purposes . ▁In ▁the ▁summer ▁of ▁ 1 9 9 8 , ▁as ▁a ▁reward ▁for ▁good ▁behavior , ▁he ▁was ▁allowed ▁to ▁drive ▁the ▁col ony ' s ▁h oney w agon . ▁On ▁December ▁ 8 , ▁ 1 9 9 8 , ▁he ▁killed ▁his ▁fourth ▁victim , ▁a ▁woman ▁named ▁Do il n its yna . ▁Un like ▁his ▁other ▁vict ims , ▁he ▁did ▁not ▁b ury ▁her ▁body , ▁but ▁only ▁covered ▁it ▁with ▁branches . ▁After ▁that ▁Sh ip il ov ▁hid ▁as ▁he ▁was ▁afraid ▁of ▁getting ▁caught . ▁When ▁he ▁returned ▁later ▁to ▁the ▁crime ▁scene ▁and ▁found ▁that ▁the ▁body ▁had ▁not ▁been ▁discovered , ▁he ▁buried ▁it ▁and ▁decided ▁to ▁continue ▁comm itting ▁mur ders . ▁He ▁committed ▁his ▁next ▁murder ▁on ▁May ▁ 1 6 , ▁ 1 9 9 9 . ▁A ▁week ▁later , ▁on ▁May ▁ 2 4 , ▁Sh ip il ov ▁killed ▁another ▁woman . ▁He ▁buried ▁the ▁bodies ▁at ▁the ▁final ▁point ▁of ▁his ▁route , ▁the ▁dump . ▁ ▁Between ▁June ▁ 1 1 ▁and ▁June ▁ 2 7 , ▁Sh ip il ov ▁committed ▁four ▁more ▁mur ders . ▁Two ▁of ▁the ▁vict