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TACOMA – After more than 40 years, Jefferson County investigators have identified a set of skeletal remains found in 1975 as a man who disappeared in 1968.

The News Tribune reports that 21-year-old David Corak’s disappearance sat as a cold case for decades before investigators were able to link a set of skeletal remains from the Olympic National Forest to the Tacoma resident. Investigators say he appears to have shot himself.

The Jefferson County Sheriff’s Office announced in January that they made a positive match through military dental records.

Before the records, investigators tried to identify the remains with a facial rendering based on the skull and inconclusive DNA tests. The rendering led investigators to Corak’s case, and they were able to obtain his service record to make the positive identification.