The mother of 49-year-old James Dale Sharman says he died Friday of injuries from an explosion at the Delek Refining plant in Tyler.
A spokeswoman for Parkland Memorial Hospital in Dallas says another worker remains in critical condition.
Tyler Fire Capt. Jeff Akin says plant firefighters were still monitoring a small fire that could burn for days.
Delek Refining President Fred Green says no cause has been determined. Meanwhile, production at the 60,000-barrel-per-day refinery has stopped.