CARBON COUNTY, Pa. (WHTM) -- A Pennsylvania man died Tuesday, four days after authorities say he was injured when a pyrotechnic device exploded.

Kevin J. Koch, 61, of Towamensing Township, east of Lehighton in Carbon County, was pronounced dead Tuesday evening at Lehigh Valley Hospital -- Cedar Crest near Allentown, according to the Lehigh County Coroner's Office.

The coroner's office said he was injured on Sept. 12 around 10:15 p.m. when they said a pyrotechnic device exploded.

The cause of death, the coroner's office said, was determined to be blast and thermal injuries and the manner of death is an accident.

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Pennsylvania State Police at Lehighton are investigating.

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