The latest explosion also injured seven people, some severely, State Police Trooper Jared Sandifer said late Friday.
Sandifer said the injured were taken to area hospitals following Friday evening's explosion at a CF Industries facility in Donaldsonville. Police identified the deceased worker as 55-year-old Ronald "Rocky" Morris of Belle Rose, La.
Sandifer said the explosion didn't pose a threat to the area surrounding the plant. He said nitrogen was being offloaded by hose from an 18-wheeler and pressurizing a metallic "vessel" when the pressure built and caused the explosion.
The state police hazardous materials unit is investigating.