The June 29 accident at the Tampa Electric Big Bend Power Station in Apollo Beach claimed a fifth life on Thursday.
BRACE Industrial Group said its employee, Armando Perez, 56, died of injuries he sustained from the accident. Molten slag, a substance that can reach temperatures upwards of 1,000 degrees, gushed from a containment tank, authorities said, burning those in the vicinity.
"Our heartfelt prayers and sympathy are extended to his family and friends as we keep our primary focus on supporting our employees and their families during this difficult time," the company said in a statement Thursday.
Only one person who was injured by the slag remains alive: Gary Marine Jr., 32.
Senior plant operator Michael McCort, 60, and contract worker Christopher Irvin, 40, died at the scene. Another BRACE employee, Antonio "Marro" Navarrete, 21, died a week after the accident. Frank Lee Jones, 55, Marine Jr.'s stepfather, died three days after Navarette.
GoFundMe pages have been set up for Navarette and Perez, BRACE confirmed.