Scott Thrower, 47, died at Baton Rouge General Hospital's burn centre, State Police Capt. Doug Cain said yesterday.
Another worker, Zachary Green, 29, died in Thursday's explosion at the plant in Geismar owned by Williams Companies Inc. Dozens of others were injured.
Green was an operator at the plant and started working for Williams last October. His body was found by hazardous materials crews moving through the site after the blast.
The US Labor Department's Occupational Safety and Health Administration is investigating. A department spokesman and company officials said the cause of the blast wasn't immediately known, but the FBI ruled out terrorism.
Also Read
Williams Companies president and CEO Alan Armstrong said at a press briefing in Gonzales that the extent of the plant's damage was unknown and it was unclear when operations would resume.
Plant manager Larry Bayer said a crew of 12 people was securing equipment at the facility yesterday and ensuring it was shut down properly after the explosion. Employees would continue to be paid.
Louisiana's health department said 88 people were evaluated at hospitals after the explosion and at least 81 had been released by yesterday morning.
Geismar is a Mississippi River community southeast of Baton Rouge. The plant is one of scores of chemical and industrial facilities dotting the riverside between Baton Rouge and New Orleans.
It makes ethylene and propylene, highly flammable gases, that are the basic building blocks in the petrochemical industry.
The state Department of Environmental Quality was testing the air around the plant for about 60 different types of pollutants.