The Union County Prosecutor's Office later identified the victim as a 27-year-old Roselle man, Justin Claiborne.
Officers responded to a report of shots fired at the Oak Park apartments on Garden Drive around 11:10 p.m. Police found the victim with a gunshot wound.
Authorities were trying to contact next of kin first before releasing the victim's name.
Anyone with information about the shooting is being urged to contact Union County Homicide Task Force Sgt. Andrew Dellaquila at 973-274-5771 or Detective Hans Noriega at 908-337-0807.
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