together. cobb county prosecutor jesse evans. >> first thing they did is go downstairs to see if they could find nick's mom. her car was there. she should be there. >> while christina stayed by the door, nick went inside. someone was there but not his mom. >> nick turned the corner and he saw something move across the bedroom down the long hallway. >> it was a dark figure wearing gloves and a mask. the stranger suddenly stabbed nick and left him for dead. >> as he's laying there on the floor, he actually sees his perpetrator run from the house. christina began really freaking out. she was terrified. >> christina ran upstairs to her apartment to get help. her babysitter katheryn was there with her boyfriend scott. they hurried downstairs. >> christina started walking towards the sliding glass door and i grabbed her shoulders and i stopped her and i said, don't touch anything. >> the glass door was smeared with blood. the scene inside was unspeakable. >> somebody said, oh my gosh, there's nick, and you could see him through the window on the floor in a pool of blood. >> i said, get out of here, go down the street. she said, what