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This undated photo provided by the Berks County Office of the Coroner shows Nicolas Paul Grubb of Fort Washington, Pa. (Berks County Office of the Coroner via AP)

This undated photo provided by the Berks County Office of the Coroner shows Nicolas Paul Grubb of Fort Washington, Pa. (Berks County Office of the Coroner via AP)

This undated autopsy sketch by the Berks County Office of the Coroner shows Nicolas Paul Grubb, who's body was found in a Pa. cave in 1977. (Berks County Office of the Coroner via AP)

This undated autopsy sketch by the Berks County Office of the Coroner shows Nicolas Paul Grubb, who's body was found in a Pa. cave in 1977. (Berks County Office of the Coroner via AP)