Daniel St. Hubert was arraigned on murder charges Wednesday after being indicted by a grand jury.
Cameras were being installed at the Boulevard Houses, where P.J. Avitto was fatally stabbed.
Daniel St. Hubert killed Prince Joshua Avitto, 6, and critically wounded Mikayla Capers, 7, police say.
Daniel St. Hubert allegedly stabbed a man Wednesday before heading to kill his mother, sources said.
Nursing student Tanaya Copeland, 18, and P.J. Avitto, 6, died in separate attacks over the weekend.
A man who stabbed two kids, killing P.J. Avitto, may also have killed Tanaya Copeland, police say.
Prince Joshua Avitto, 6, was killed in the Brooklyn stabbing, police said.
Christopher Marshall, 23, was arraigned on Friday, the district attorney's office said.
Relatives reminisced about Halii McCord as the investigation into her murder continued.
Halii McCord, 4, died of blunt impact to the torso, according to the city Medical Examiner's office.
Police are investigating the death of Halii McCord, who died Tuesday.
The 49-year-old woman suffered burns to her head and face, police say.
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