Police have released security photos taken at an IHOP on Bergen Street where Papa Khaly Noiyae was shot in March.
Noiyae, originally from Senegal, was killed while trying to break up a dispute in the restaurant's parking lot.
He was trying to help others escape the area.
Police hope someone can identify the men in the pictures or the car they drove that night.
Sources say the shooting stemmed from a fight that happened inside the restaurant.
Crime Stoppers of Essex County is offering a $10,000 reward for information leading to the capture of the suspect.