Philip Chism, 14, stands during his arraignment for the death of Danvers High School teacher Colleen Ritzer in Salem District Court in Salem,
(CBS) DANVERS, Mass. - Sources tell CBS Boston that a box cutter was used to kill Colleen Ritzer, a 24-year-old math teacher at Danvers High School, and that her body was carried out of the school in a recycling bin.
Fourteen-year-old Philip Chism, a student at the Massachusetts high school, is charged with her murder. He was ordered held without bail at his arraignment Wednesday.
Police say surveillance cameras and interviews with Chism indicate Ritzer was murdered and then left in the woods near the school, reports the station.
Essex County District Attorney Jonathan Bodgett has said Ritzer's body was found early Wednesday morning. She had been reported missing Tuesday night.
Prior to discovering the body, investigators found blood in a second floor bathroom of the high school, the D.A. said.
Authorities are continuing to investigate the murder and have not publicly confirmed how she was killed or what the motive may have been.
Chism had moved to Massachusetts from Tennessee just before the school year and was described by classmates as pleasant, but quiet.
A freshman student who was in Ritzer's class with Chism told Crimesider that as far as she knows, there was nothing unusual about the relationship between the teacher and student.
"He was always quiet. ...He never talked to anyone," the girl, who wanted to remain anonymous, said.
Classes at Danvers High School are scheduled to resume Friday.