Deputies said a driver swerved and hit two construction workers, who were rushed to the hospital via LifeFlight. One died, while the other was critically hurt.
The Harris County Precinct 4 Constable's Office said a construction vehicle fell on top of a worker while he was at a job in the Spring area.
Galveston officials confirmed the explosion happened while the workers were doing maintenance work at Texas International Terminals on Thursday.
An attorney for several PEMEX workers told ABC13 that they're suing the Mexican energy company and are still out of work about a week after a chemical leak at the Deer Park refinery killed two people and injured 35.
Once crews arrived at the scene, they found that the worker had fallen about 20 feet from one roof to a lower roof with limited access.
Four suspects are wanted after a security guard and pregnant employee were assaulted in the robbery in May.