ONTARIO, Ore. -- An inmate who threatened a fellow prisoner at a Portland jail last year is the suspect in a fatal assault at the Snake River Correctional Institution in Ontario.

The Oregon Department of Corrections says 23-year-old Jason Gould died Saturday from injuries he sustained from an assault involving cellmate Thomas Riffenburg.

Last year, Riffenburg threatened an inmate at Multnomah County's Inverness Jail with sharp object fashioned from aluminum venting material.

He was convicted of attempted assault and possession of a weapon as an inmate, along with robbery charges out of Marion and Multnomah counties. His earliest release date is in 2028.

Corrections spokeswoman Liz Craig says police are still investigating Gould's death, and Riffenburg has not been charged. If the investigation concludes there was a crime committed, it will go the the district attorney's office.

Craig also told us that Riffenburg is still being held at Snake River Correctional Institution at this time, but is secluded to the disciplinary segregation unit.

Gould was imprisoned on two counts of attempted robbery and two counts of heroin possession from Linn County. His earliest release date would have been in 2017.

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