Michael Chadd Boysen will face life in prison without possibility of parole when he’s sentenced Oct. 18 for murdering his grandparents in March.

Boysen, 27, pleaded guilty Friday to two counts of aggravated first-degree murder in the slayings of his grandparents, Norma and Robert Taylor, at their Fairwood home.

He had pleaded not guilty to the charges in April. In August King County Prosecutor Dan Satterberg decided he wouldn’t seek the death penalty if Boysen was convicted.

Boysen had just been released from prison on a burglary conviction; his grandparents hosted a welcome-home party for him the night they were killed.

After killing his grandparents, Boysen fled in their car to Oregon, when he was arrested after a 10-hour standoff with police at Lincoln City motel.

Sentencing is scheduled for 9 a.m. Oct. 18 before King County  Superior Court Judge Douglass North in courtroom W-764 of the King County Courthouse in downtown Seattle.