NEW YORK (CBSNewYork) – There has been a major development in the case of a college student brutally stabbed to death in Morningside Park.

The NYPD has released new photos of another suspect wanted in connection with the killing of 18-year-old Barnard College student Tessa Majors.

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A 13-year-old, already in custody after confessing to the crime, told police this new suspect was the person who stabbed Majors last Wednesday during an attempted robbery.

Tessa Majors (credit: Conrad MacKethan)

Police found that 13-year-old while canvassing the area near Morningside Park. The boy was caught in the lobby of a building at Manhattan Avenue and 119th Street at around 4:20 p.m. Thursday. He was wearing clothes that matched the description of the suspect, sources said. Police arrested him for criminal trespass and during a search found he was carrying a knife.

Another 14-year-old suspect who allegedly went through Majors’ pockets was released last week after his lawyer told him to stop answering questions.

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Barnard College students say, on the heels of the murder, the end of a semester has never been more stressful or upsetting.

“A lot of people like myself just want to go home, decompress and be with family in this kind of time,” Joan Martinez said.

Police are still keeping a careful watch over campus while searching for that third person possibly connected to the killing.

The NYPD was for searching for the suspect in the newly released photos in Harlem Monday after sources say a family member allegedly arranged for him to turn himself in — but he never showed up. Sources now say that family member is not cooperating.

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Anyone with information about this suspect is asked to call the NYPD’s Crime Stoppers hotline at 1-800-577-TIPS (8477) or 1-888-57-PISTA (74782) for Spanish. You can also submit a tip via the Crime Stoppers website, by tweeting @NYPDTips or by texting 274637.