Police responded to the unit block of South Broad Street around 9:30 p.m. Tuesday.
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When they arrived, officers found two gunshot victims and at least six shell casings at the scene.
According to the Salem County Prosecutor's Office, Juniel Feliciano-Lopez, 24, was the victim of a homicide after suffering multiple gunshot wounds.
The suspect was identified as Henry Kivelier Montero Jr., 23, of Philadelphia, officials said.
Montero died of a single self-inflicted gunshot wound at the scene.
The shooting is believed to have taken place after an argument that began between the two men on March 30, investigators said.
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No other details about the victims have been released.