HARTFORD, Conn. (CBSNewYork/AP) — The Connecticut teenager killed on the day of her junior prom died of stab wounds to her torso and neck, the chief medical examiner said Sunday.

A fellow classmate has been charged with murder as a juvenile in the stabbing death of 16-year-old Maren Sanchez in the hallway of Jonathan Law High School in Milford, Conn. His name was not released because of juvenile offender laws.

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The teen’s lawyer said he is under psychological evaluation and will not appear at his arraignment in New Haven on Monday, WCBS 880 Connecticut Bureau Chief Fran Schneidau reported.

Attorney Richard Meehan said Saturday that the 16-year-old suspect was committed and will likely remain in a medical facility for two weeks.

Although the teen is currently charged as a juvenile, he could be charged as an adult after his arraignment on Monday.

“Anytime there’s a homicide involving somebody 14 or older, the juvenile court has the authority to transfer the matter to the adult docket,” Meehan said.

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Meehan said Saturday that the suspect’s family is devastated for him as well as for Sanchez.

The high school chose to cancel class for Monday. Instead, there will be a memorial service Monday night on the football field, CBS 2 reported.

Authorities are investigating whether Sanchez was stabbed after turning down the suspect’s invitation to prom.

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