The murder of a Danvers, Mass., High School math teacher by a student may have been caused by the 14-year-old's reported infatuation with his instructor, The Daily Mail reported.

Philip Chism was arrested and charged with the Oct. 22 murder of 24-year-old Colleen Richter. He admitted to police that he killed her by using a box cutter before dumping her body in the woods behind the school, though he has yet to confirm a motive for his actions.

A move to keep the Massachusetts case under wraps has been granted by Chism's attorney's, who asked for information to be kept out of the media while it is determined what evidence will be admissible in court when the teen goes to trial.

Before the motion was granted, police involved in the case said they found nothing to suggest that Ritzer had an untoward relationship with her allged killer.

"There is absolutely no evidence of any misconduct or wrongdoing by Ms. Ritzer of any sort," assistant Essex District Attorney David O'Sullivan said in a court hearing.

Detectives are now working on a theory that Chism, who moved to Massachusetts from Tennessee at the beginning of the school year, was obsessed with Ritzer and snapped when his advances were rejected. Police are reportedly seeking to examine the drawings Chism made in his math notebook, which spurned Ritzer to ask him to stay after class just hours before her murder.

"He was drawing in his notebook and not working. He always draws, but I didn't ever see what he was sketching because he was quite private about it," Rania Rhaedaoui, a classmate who sat at the desk next to Chism, told The Daily Mail. "Miss Ritzer spotted what he was doing and asked if he could stay behind so she could keep him. It wasn't a punishment and it was something she did with a lot of students. If you couldn't stay it was no problem."