The 16-year-old Connecticut high school student accused of murdering his classmate will be arraigned on Monday. Christopher Plaskon is reported to have stabbed 16-year-old Maren Sanchez on the day of their junior prom after she turned down his offer to be her date.

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It’s likely that Plaskon will be charged as an adult in her murder. He’s currently being held at a psychiatric hospital for evaluation.

Friends and students at Jonathan Law High School describe Plaskon as well-liked and funny. He played football, baseball and track.

New reports show that he suffered from depression and cut himself in the eighth grade. He also received medication for Attention Deficit Hyperactivity Disorder. The week of the stabbing, Plaskon visited the school counselor.

On Fox and Friends, Peter Johnson Jr. said legally, the school may not have any culpability for knowing something was wrong with Plaskon and not intervening.

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Read the Associated Press report for more:

Milford Alderwoman Greta Stanford said the school would remain closed Monday. A memorial service is scheduled for 7 p.m. on the school's football field. Organizers are seeking donations so the junior class can buy a memorial bench in Sanchez's honor.

Mark Robinson, a technical education teacher who saw the suspect being taken out of the school in handcuffs, said Plaskon is the third of five brothers and has a good sense of humor. His family has deep roots in the community, Robinson said.

"There's no reason to suspect he would have done this. I think that's what makes it harder," Robinson said.

Classmate Imani Langston, who saw Plaskon being read his rights and taken away in a police car, said Sanchez and the boy were just friends and had never dated.

Sanchez, a member of the National Honor Society who was active in drama and other school activities, had been focused on prom in the days before her death. She had posted a photograph on Facebook of her blue prom dress and was looking forward to attending with a new boyfriend.

People who know Plaskon said he is an athlete and described him as genial and respectful.

"His family is devastated not only for him, but the youngster who was killed," Meehan said." It's a terrible situation all the way around."

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