One of four workers injured in last week’s explosion at the MarkWest natural gas processing plant in Chartiers Township has died.

Jeffrey Fisher, 61, of Salem, W.Va., died Tuesday afternoon at UPMC-Mercy hospital in Pittsburgh. His death was confirmed by the Allegheny County medical examiner’s office.

Fisher was being treated for burns at UPMC-Mercy hospital in Pittsburgh. He was one of four employees of Energy Transportation, LLC, of Bridgeport, W.Va., who were injured in the blast, which occurred about 6 p.m. last Thursday. Jeff Yates, Washington County’s public safety director, said it is believed the workers were cleaning a pipeline when vapors caught fire and ignited other combustible materials.

Two victims were flown to Mercy and two to West Penn Hospital in Pittsburgh.

Andria Wymar, spokeswoman for Energy Transportation, said the other three workers remain hospitalized but are recovering from their injuries.

The Occupational Safety and Health Administration, a branch of the Department of Labor, is investigating the incident. OSHA’s Joanna Hawkins told the Observer-Reporter last week “it doesn’t look like Energy Transportation, LLC, has a prior OSHA investigation history.”

Chartiers police and firefighters responded, along with seven other fire departments, a state police fire marshal, four staffers from the state Department of Environmental Protection and the Washington County hazardous materials team.

A spokesman for MarkWest said in a statement: “We are deeply saddened that one of the contract employees injured during the Dec. 13 incident . . . has died of his injuries.

“We continue working with federal, state and local agencies to investigate the incident. Protecting the health and safety of workers and the communities where we’re privileged to operate is our highest priority, and we work hard to ensure incidents like this never occur.”

Business Writer

Rick Shrum joined the Observer-Reporter as a reporter in 2012, after serving as a section editor, sports reporter and copy editor at the Pittsburgh Post-Gazette. Rick has won eight individual writing awards, including two Golden Quills.

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