Michael Chadd Boysen, who killed grandparents, died of natural causes

Michael Chadd Boysen, the Renton man convicted in the 2013 killing of his grandparents, died on March 18 of natural causes at the Washington State Penitentiary in Walla Walla, according to the Walla Walla County coroner.

By Dean Radford • March 24, 2015 2:07 pm

Michael Chadd Boysen, the Renton man convicted in the 2013 killing of his grandparents, died on March 18 of natural causes at the Washington State Penitentiary in Walla Walla, according to the Walla Walla County coroner.

Boysen died of a pulmonary emboli, a blood clot to the lungs, according to coroner Richard Greenwood. Final toxicology and autopsy reports will take approximately 8 to 10 weeks to complete.

Boysen, 28, returned to his cell at approximately 7:40 a.m. after taking a shower and lost consciousness, according to a March 19 press release from the Washington state Department of Corrections.

Staff attempted life–saving measures, but Boysen was pronounced dead at approximately 8:10 a.m.

Boysen had served 16 months of a life sentence without the possibility of parole for the March 2013 murders of Robert and Norma Taylor, just hours after they picked him up from a state prison in Monroe.