UPDATE: Boysen Captured: Suspect in the Killing of a Renton Couple Arrested Without a Fight

Oregon police raided an oceanfront motel Monday evening and arrested the man suspected of killing his grandparents in Renton the past weekend.

No shots were fired Tuesday when Lincoln City police officers raided Michael Chadd Boysen's room, MyNorthwest.com, first reported. Boysen, at large since Saturday, had been sought by King County authorities in connection with the death of grandparents, both in their 80s.

The King County Medical Examiner officially released the names Tuesday of Boysen’s grandparents: Robert R. Taylor, 82, and Norma J. Taylor, 80. The cause and manner of death were listed as still under investigation.

Boysen first had been located by local police when an alert motel clerk heard his name on television and realized the motel had registered someone of that name Monday night. She called 911. The motel was evacuated.

Since 11 a.m. Tuesday, authorities had been trying to talk the 26-year-old into coming out. Early in the evening, when Boysen stopped responding, authorities no longer waited.

"We tried to negotiate," Lincoln City Police Chief Keith Kilian told MyNorthest.com. "We saw an opening that didn't compromise the safety of our officers."

According to the Portland Oregonian, the SWAT team found Boysen alone and on the floor with self-inflicted wounds. A Life Flight helicopter airlifted him to a Portland hospital for treatment. Reportedly, he is in critical condition.

"It was a very successful mission," Kilian said to the Oregonian. "No officers were hurt, and our citizens will soon be able to return to their homes."

King County authorities didn't know when Boysen might be returned to Washington State to face charges.

The manhunt began Friday after the King County Sheriff's office responded to a the report of a double-homicide in the in the Fairwood neighborhood of unincorporated Renton. An elderly couple, the Taylors, had been found dead in their home by their daughter.

According to accounts from investigators, the family and neighbors:

Boysen, who had a history of crime and drug addiction, had been released from prison last Friday.

King County Superior Court records show Boysen was convicted of first-degree (armed) and second-degree robbery in 2006. He was charged with robbing a Dairy Queen where he worked of about $800 in cash, as well as a QFC, and two Bartell’s drug store, the latter two for the drugs Oxycodone and Oxycontin.

His family members arranged for him to stay with his grandparents for the night. That night, they threw him a welcome home party, investigators said.

After the party, family members said they received a text from Norma who thanked everyone for coming. Boysen was supposed to stay with another relative the next evening.

This relative, investigators said, showed up the next morning to pick up Boysen.

No one answered the door. The relative called the Taylors' daughter. Later, she came to the home and also knocked. Again, no answer.

She let herself into the home, she found her parents' bodies. Missing were Boysen and her parents' 2001 Chrysler 300.

“We are at a loss as to why he killed them," Urquhart said. The family, he added, is traumatized.

Two days later, following a manhunt that stretched across the Pacific Northwest, a clerk at the the Westshore Oceanfront Motel in Lincoln City recognized Boysen's name in the motel's registry.

She called police.

King County authorities are still seeking a motive or a reason behind the attacks whcih investigators described as brutal.