The man accused of fatally shooting a deli worker in August appeared in court Monday, but the judge postponed proceedings.
Efrain Guzman has pleaded not guilty to 19 charges, including attempted murder of a police officer, in connection with the death of Wali Camara.
Investigators accuse Guzman of taking an officer's gun and fatally shooting the 49-year-old Camara.
Members of Camara's family, leaders in the Black Lives Matter NYC group and attorney Sanford Rubenstein attended the hearing.
The judge scheduled Guzman's next appearance for Jan. 18.