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NEW YORK — A third suspect in the stabbing death of Barnard student Tessa Majorsis in custody, police said.

The unidentified teen was processed at the Manhattan district attorney’s office and expected to appear in court Wednesday afternoon, according to police.

Majors was stabbed and robbed while walking through Morningside Park on Dec. 11. After she was wounded, she stumbled up a flight of stairs to street level seeking help.

Her last words were, “Help me, I’m being robbed,” Manhattan District Attorney Cyrus Vance said.

The suspected stabber in the case, 14-year-old Rashaun Weaver, also was expected to be arraigned in court Wednesday. Weaver is being tried as an adult on murder and other charges.

A 13-year-old boy was previously charged in family court in connection with the student’s death, though he is not accused of stabbing Majors.