Chief assistant Essex County prosecutor Thomas Fennelly said 14-year-old Abdul Frazier died early Friday after three weeks in a hospital.
News of an arrest comes on the same day as the funeral for 13-year-old victim Zainee Hailey.
Shavar Jeffries held a news conference Monday near the site of a Christmas night shooting that left two young teenagers dead and another seriously wounded.
Community leaders and concerned residents gathered for a vigil in Newark Sunday afternoon, following a shooting that left two teenagers dead on Christmas night.
There was new information on Friday night, in the shooting that left two teenagers dead in Newark, N.J.