Authorities said the gunfire erupted around 1 a.m. outside the Hamilton Mall on East Black Horse Pike near the entrance to the Macy's store.
Officers arrived to find a 20-year-old man from Atlantic City, N.J., who had been shot multiple times. He was pronounced dead at the scene.
They found a 26-year-old man from Clayton, N.J., identified as the brother of the deceased, who had been shot in the leg.
Medics rushed that victim to AtlantiCare Regional Medical Center-City Division, where he was listed in stable condition.
The names of the victims have not been released.
The circumstances surrounding the shooting were not immediately clear.
WPVI-TV was there just before 7 a.m. Friday as police towed away a silver SUV pockmarked with bullet holes.
Anyone with information about this incident was being asked to call the Atlantic County Prosecutor's Office Major Crimes Unit at (609) 909-7666 or the Hamilton Township Police Department at (609) 625-2700.
The mall appeared to open at 6 a.m., as scheduled, for Black Friday shopping.