Flames broke out at a building in the unit block of Park Drive South at around 10 a.m. Tuesday.
Police and firefighters arrived at the scene and removed a man described as elderly from the home.
The victim was rushed to an area hospital, where he pronounced dead at 11:30 a.m.
There was no immediate word what may have sparked the blaze.
The Essex County Prosecutor's Office is leading the investigation.
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