came to the school for a face-to-face meeting. >> we had no information from the schools, but we have since learned the schools did have contact with the student. >> reporter: just three hours after that last meeting with his parents authorities say school security cameras show the gunman walking out of the bathroom and entering the hallway, the attack called premedicated by the oakland county prosecutor who says they found video and journal entries of him talking about killing students. >> it was premedicated. >> the 15-year-old sophomore pleading not guilty to a slew of charges. this morning, new details about what happened inside oxford high. police say he fired off more than 30 rounds. he had 18 bullets left when police stopped him minutes later. police say the murder weapon, a handgun was purchased days earlier by the suspect's father. four students were killed,