GREAT FALLS — A Montana State Prison inmate who had been on the run for 38 years after he was released on parole only to be located by the grandson of the man he murdered has died.

The Great Falls Tribune reports 86-year-old Frank Dryman died of natural causes at a Lewistown infirmary Monday.

Dryman was sentenced to life in prison in 1955 for shooting and killing Clarence Pellett.

He was 19 years old at the time of the crime and had initially been given the death penalty before social activists campaigned on his behalf.

Dryman was granted parole in 1969 and disappeared a few years later.

In 2010, Clarence Pellett's grandson, Clem, and a private investigator located Dryman in Arizona.

Clem Pellett says Dryman never showed remorse for what he did.

Copyright 2017 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Outbrain