A Florida man was killed while hunting in northeastern Pennsylvania over the weekend after his portable propane heater exploded. It marked the state’s third fatal hunting incident in a week, investigators said.

Gregory Scheer, an 81-year-old resident of Chiefland, Fla., was hunting from a stand on the ground in Texas Township on Saturday when the heater's attached propane bottle exploded and ignited two other nearby bottles of the gas, Pennsylvania State Police said.

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Investigators said the blast could have resulted from a malfunction or an improper connection that caused the attached propane bottle to explode.

A friend who owns the property heard the blasts and found Scheer dead, according to police. A cause of death is pending an investigation. An autopsy was planned for this week.

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The incident marks the third fatal hunting accident in Pennsylvania to occur this month.

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A hunter died after falling 30 feet from a tree stand on Dec. 3 and another died the following day after accidentally shooting himself with a crossbow, Lehigh Valley Live reported.

The Associated Press contributed to this report.