SALEM, Ore. (AP) — A convicted killer is back in custody after Oregon corrections officials realized he was released a month too early.

KPTV reports (http://is.gd/b5jGxH ) Marc Trice was released from the Oregon State Penitentiary on Monday. He was due for release and post-prison supervision in mid-September.

Trice has been in prison since 1994 for killing 16-year-old Sandra Lee Raph in La Grande.

According to state guidelines, some convicts are eligible for a 30-day release prior to their actual parole date. However, these rules don't allow for the early release of convicts classified as "dangerous offenders," a label that applies to Trice.

Department of Corrections officials realized the error and took Trice was back in custody Wednesday.

Officials say he cooperated with police. He's now at the Coffee Creek Intake Center in Wilsonville.

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Information from: KPTV-TV, http://www.kptv.com/