The man accused of strangling his grandparents in Renton has been released from a Portland hospital and has agreed to be returned to Seattle to face prosecution.

Michael Chadd Boysen was treated for self-inflicted cuts after his arrest March 12 at a Lincoln City, Ore., motel.

KIRO-FM reports ( http://bit.ly/Z9Ld1C) Boysen is being held in the Multnomah County Jail and has waived extradition.

Authorities say he killed 82-year-old Robert R. Taylor and 80-year-old Norma J. Taylor after they picked him up from prison on March 8 and held a welcome home party for him at their home.

Boysen had just finished serving nine months in prison on a burglary conviction and was previously in prison from 2006 to 2011 for robbery convictions related to an addiction to narcotic painkillers.

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Information from: KIRO-FM, http://mynorthwest.com/