Two people, a man and a woman, were found dead in a car on Saturday afternoon at the corner of South 10th Street and 15th Avenue.
Police believe they were targeted, but no motive has been identified.
The victims were identified as 23-year-old Damien Matteaux, of Newark, and 16-year-old Nyquese McCollum, of Irvington.
Authorities say the victims are cousins and were in route to pick up his girlfriend at her place of employment in Union.
Detectives believe that Matteaux was the target.
The Essex County Prosecutor's Office Homicide Task Force is investigating, and no arrests have been made so far.