Suspect in fatal stabbing had been stalking ill-fated ex-girlfriend for months after she ended relationship: victim's brother

Jonathan Peña Castillo, 21, of Patterson, N.J., is accused of ambushing Edith Rojas, 19, a Bronx Community College student, with a large kitchen knife in Manhattan as she returned to her apartment around 4 p.m. on New Year's Eve. Witnesses say she was stabbed seven times in the torso...  
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