Authorities are investigating after an Indiana man was found dead Sunday in what officials characterized as an accident during a deer hunting trip in Harrison County.

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Members of 58-year-old Thomas Zimmerman's party found him unresponsive Sunday night as they were hunting on private property near Elizabeth, officials with the Indiana Department of Natural Resources said in a news release. Indiana conservation officers were called around 6:40 p.m.

Investigators said Zimmerman, of Borden, was in an elevated, ladder-type tree stand. Authorities used a rope and pulley system to lower Zimmerman from the tree stand.

“Zimmerman died due to a close-range gunshot wound to the head,” Indiana Department of Natural Resources officials said. “No foul play is suspected.”

Additional information on the circumstances surrounding the accident was not immediately available. Authorities said Monday that they are awaiting the results of toxicology and other tests.