I checked several sources without success for an obituary. New Jersey newspapers online are somewhat limited, compared to other states.
The Newark Public Library will retrieve an obit from microfilm, but you need the exact date.
Since you know the month and year, you CAN order a death certificate from NJ Health - unfortunately they now blank out the cause of death. You might do better, at lower cost, by hiring a professional (or finding a willing volunteer) to retrieve the full certificate for you.