The judge is treating the suspect, Philip Daniel Chism, as an adult, which meant the proceeding was open to the media.
New details emerged during the court session. According to prosecutors, there is surveillance video of Ritzer going into a bathroom at Danvers High around 2:45 p.m. The video also shows the suspect going into the bathroom about 2:50 p.m.
"It was learned from an interview of the juvenile suspect and video surveillance footage recovered from the school," read court documents, "that a juvenile student that attends Danvers High School assaulted and subsequently murdered [the victim] and disposed of her body near the high school grounds."
An attorney for Chism had no comment on leaving the courthouse in Salem.
The next court date was set for Nov. 22.
You can view the first minute of Chism's arraignment in the attached video from the Associated Press.