UPDATED: Authorities located Dennis John Davis in downtown Portland Wednesday morning.

Authorities have issued a warrant for a violent sex offender who failed to report to his parole officer.

Dennis John Davis ( Courtesy Multnomah County Sheriff)

Dennis John Davis, 56, was sentenced to prison in 1993 for counts of rape, sodomy and kidnapping, according to a news release from Multnomah County. Davis has a long criminal history that includes prior sex offenses, property crimes and non-sexual violence. He is considered a "dangerous offender," according to a news release from Portland Police.

Davis has violated his parole multiple times since being released from prison in June.

David Austin, a Multnomah County spokesman, said Davis removed his electronic monitoring bracelet within a few days of being released this summer. Davis turned himself in and spent 30 days in jail, Austin said. A few months later Davis was out past curfew and allowed the battery in his monitoring device to die. He again turned himself in and spent 60 days in jail, Austin said.

The battery in Davis' device died again on Saturday, Austin said. Over the weekend authorities searched the area of Forest Park and Washington Park, Davis' last known location.

Davis is 5-foot-9-inches tall and weighs 197 pounds. He has gray hair and blue eyes.

Davis' last residence was in downtown Portland, according to a news release from Portland Police.

The Portland Police Bureau's Sex Offender Registration Detail is working with the Multnomah County Department of Community Justice to locate Davis. Authorities ask anyone with information about his whereabouts to call 9-1-1.

"We consider him to be extremely dangerous, and we don't want people to engage him if they see him," Austin said. "We want them to call 9-1-1."

--Laura Frazier

lfrazier@oregonian.com

503-294-4035

@frazier_laura

This post was updated with additional information about Davis' parole violations.