The three-alarm fire broke out just after 6:30 p.m Tuesday at 650 East 26th Street.
The body of Russel Mahan was found inside the severely damaged two-family home, authorities said.
No other injuries were reported.
There was no immediate indication of what may have caused the fire.
Various agencies united to investigate: the Paterson police and fire departments and the Passaic County prosecutor’s and sheriff’s offices.
Michael Jannicelli for DAILY VOICE
Click here to follow Daily Voice West Milford and receive free news updates.