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SEATTLE The man accused of strangling his grandparents at their Renton home after he was released from prison pleaded not guilty Thursday to two counts of aggravated first degree murder.

Michael Chadd Boysen, 26, is accused of killing Norma and Robert Taylor, ages 80 and 82.

If convicted, Boysen faces either the death penalty of life in prison without release. The King County prosecutor has 30 days to determine whether to pursue the death penalty.

According to charging documents, the Taylors had picked Boysen up from the Washington state prison at Monroe on March 8. They drove him to a meeting with a parole officer later that day, helped him get an identity card from the Department of Licensing and held a party for him. Police say once everyone left, Boysen killed the two then fled the scene with their vehicle.

Boysen was arrested on March 12 at a motel in Lincoln City, Oregon, after a 10-hour standoff with police.

Boysen had just finished serving nine months in prison on a burglary conviction, said Washington state Corrections Department spokesman Chad Lewis. He was previously in prison between 2006 and February 2011 for four robbery convictions. Those convictions were related to an addiction to narcotic painkillers, Lewis said.

Boysen Charging Documents

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