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Man dies after being injured in Washington Co. gas plant explosion

PITTSBURGH — A man who was badly burned in an explosion at a Washington County gas plant last week has died.

Jeffery Fisher, 61, of Salem, West Virginia, died Tuesday afternoon at UPMC Mercy, the Allegheny County Medical Examiner’s Officer announced Wednesday.

Fisher was one of four contractors injured Thursday in an explosion and subsequent fire at the MarkWest facility in Houston.

RELATED: 4 hurt in explosion at gas plant in Washington County

"We are deeply saddened that one of the contract employees injured during the Dec. 13 incident at our Houston, Pennsylvania, facility has died of his injuries," MarkWest Energy said in a statement. "We pray for the family of our colleague and mourn his passing."

Fisher’s injuries were not specified, and the other three victims have not been identified.

An investigation into the cause of the explosion in a storage tank is ongoing.