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Drummond Island — Authorities say a missing U.S. Marine died of a self-inflicted gunshot wound after exchanging shots with two border patrol agents helping to search for him.

The state police say in a release Wednesday the cause of death for 38-year-old Aaron Furness of Woodbridge, Virginia, was made after an autopsy.

Furness was found dead Thursday inside a cabin on Drummond Island in Lake Huron near .Sault. Ste. Marie.

Furness was reported missing Sept. 23 and was believed to be in the area. Border agents discovered footprints and tracked them to the cabin. They were shot at and took cover while returning gunfire.

The circumstances surrounding last week’s shooting remain under investigation.

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