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The Washington state Department of Corrections (DOC) on Wednesday was preparing for the extradition of double-homicide suspect Michael Boysen, who is in a Portland hospital recovering from self-inflicted cut wounds he sustained before his arrest Tuesday night.

Donta Harper, DOC field administrator for King County, said that after authorities in Oregon prosecute Boysen he will be taken to the Washington Corrections Center in Shelton to serve a minimum of 30 days in prison for violating the terms of his probation.

“He’ll be held in Oregon on local charges, go through whatever charges they have there, then once he clears he’ll be extradited to serve DOC time,” Harper said.

It wasn’t immediately known what charges Boysen, 26, could face in Oregon. He will also likely face murder charges in Washington state in connection with the deaths of his grandparents, Robert Taylor, 82, and Norma Taylor, 80, at their home near Renton last weekend.

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The King County Sheriff’s Office says the couple was killed just hours after Boysen was released from the Monroe Correctional Complex, where he had served time for a 2012 conviction for attempted residential burglary.

On Monday, DOC Secretary Bernie Warner issued an arrest warrant for Boysen because he had failed to report for substance-abuse treatment required under his release from prison. By then he was already the subject of an intensive multistate manhunt in connection with the slayings.

The search for Boysen ended Tuesday night when police in Lincoln City, Ore., stormed a beachfront motel room and arrested him.

Boysen was taken into custody around 7 p.m. at the Westshore Oceanfront Suites following a 10-hour standoff.

Sgt. Cindi West of the King County Sheriff’s Office said Boysen was unconscious but alive when he was taken into custody. She said his wounds may have come from broken glass.

He was taken to a nearby hospital and then airlifted to Legacy Emanuel Medical Center in Portland, where he was in critical condition. Boysen’s condition was upgraded Wednesday morning to serious.

Lincoln City police Chief Keith Kilian said no shots were fired. Police entered the room after a video-equipped robot caught footage of Boysen falling to the floor.

Police had released tear gas into the room three or four times before the standoff came to a close, according to the hotel’s operational manager, Adrian Kallimanis.

Kilian said officers had been using a public-address system to talk with Boysen sporadically throughout the day after a window in the motel was broken using a water-cannon device.

“He had stopped talking to us, and that got his attention,” Kilian said.

Police received a call about Boysen being at the motel around 7:30 a.m., after the property managers recognized his face and name on a morning news show, according to Kilian.

Kent Landers, who owns the motel, said Boysen had checked in the previous night, using his real name and driver’s license.

Kilian said Boysen, who had allegedly stolen his grandparents’ red 2001 Chrysler 300, had acquired another vehicle to get to the motel.

Police crept up to the Westshore early Tuesday, not wanting to alert Boysen, and silently evacuated the rest of the motel, he said.

Landers said this is usually a quiet time of year and only a few people were checked in when police arrived at his 20-unit motel at 3127 S.W. Anchor Ave. Lincoln City has a population of about 8,000.

Lincoln City police then settled in until Oregon State Police arrived with armored vehicles, a robot and a public-address system around 11 a.m. He said there was no telephone in the motel room.

“We said something like, ‘This is the police. You need to come out,’ and he said, ‘I don’t want to. Go away,’ ” said Kilian, who added, “We’re not going away.”

Kilian said during the standoff that police had not seen any evidence that Boysen was armed. However, “King County said to consider him armed and dangerous and that’s what we’re doing,” he said.

Negotiations with Boysen occurred on and off all afternoon, he said, and police were not in a rush as long as Boysen was willing to talk.

Boysen had been sought since Saturday, when his grandparents were discovered slain. Investigators found that Boysen had been searching the Internet in an apparent effort to acquire firearms. Investigators also learned Boysen had allegedly spoken of killing relatives and authority figures.

King County sheriff John Urquhart said in a news conference Monday that Boysen should be considered armed and extremely dangerous. He said the threat Boysen posed to the public and law-enforcement officers could not be overstated.

According to Urquhart, Boysen’s grandparents picked him up from the Monroe Corrections Complex on Friday after he had served nine months of a 16-month sentence for a 2012 attempted residential-burglary conviction.

The couple then took Boysen to check in with his probation officer and to get an identification card. They brought him home and hosted a welcome-back party attended by numerous other relatives, who all told police Boysen had seemed “normal” and happy to be out of prison, Urquhart said.

He said Boysen is suspected of killing his grandparents sometime between 9 p.m. Friday and noon Saturday.

Boysen’s mother discovered her parents’ bodies around 5 p.m. Saturday when she used her key to enter the home, according to the Sheriff’s Office.

Their cause of death has not yet been released by the King County Medical Examiner’s Office, but authorities said they did not die of gunshot wounds.

Boysen had previously served five years in prison on four counts of robbery and possession of stolen property after he pleaded guilty to robbing several pharmacies and a grocery store.

He told police after his arrest that he was addicted to the narcotic OxyContin.

Christine Clarridge: or 206-464-8983

Jennifer Sullivan: or 206-464-8924.

Seattle Times staff reporter Alexa Vaughn and news researcher Miyoko Wolf contributed to this report, which includes information from Times archives and

The Associated Press.

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