NEW : Georgia police chief steps down after being critical of the handling of the case . " Brunn covered himself with a sweatshirt in a jail cell , investigators say . A medical examiner does n't find any ` ` other significant trauma '' on his body . He had pleaded guilty this morning to murdering 7-year - old Jorelys Rivera .
NEW : Georgia police chief steps down after audit critical of the handling of the case . Ryan Brunn hung himself with a sweatshirt in a prison cell , investigators say . A medical examiner does n't find any `` other significant trauma '' on his body . He had pleaded guilty this week to murdering 7-year-old Jorelys Rivera .