He confessed to fatally stabbing 15-year-old Matthew McCree and critically injuring 16-year-old Ariane Laboy with a switchblade he brought into school, according to police.
McCree and Laboy were taken to St. Barnabas Hospital, where McCree was pronounced dead and where Laboy remains in critical but stable condition.
The 15-year-old who died was identified as Matthew McCree who sustained a fatal wound to the chest, police reported. He has been charged with one count each of murder, manslaughter and attempted manslaughter and two counts each of attempted murder, assault and criminal possession of a weapon.
Hornbeck said that Cedeno reported the alleged bullying to school officials and that he would often come home in tears. Police said he then walked into the assistant principal's office, sat down and waited while 911 was called.
The school's mission, according to its website, is "to engage students in a challenging academic program centered on wildlife conservation, to expose them to the wonders of the natural sciences, and to help them to cultivate their life skills so that they are ready to succeed in college and become independent adults who act respectfully within their communities". His lawyer didn't immediately comment.
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The New York City Department of Education - the largest school district in the country, with more than 1.1 million students in more than 1,800 schools - has had just one other homicide on school property in the last decade, in 2014 when a 14-year-old boy was killed in front of his Bronx middle school. He'd wear stuff from H&M.
"He usually gets bullied a lot", Jones added. He likes Kylie Jenner, that sort of stuff.
"Heard he was being harassed", she said.
"I'm heartbroken at the loss of one of our students and this tragedy should never have taken place", said Schools Chancellor Carmen Fariña.
Some students will feel safe because when classes start resume, they will go through metal detectors and be subject to random screenings.
"You need to ask the right questions first, before they paint people, making it look like some mean person", Victor added.
The suspect's family extended their condolences to relatives of his victims.