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Michael L. Boysen (Photo: handout from King County Sheriff’s Office)

UPDATE: An arrest warrant has been issued for 26-year-old Michael L. Boysen, the grandson of a Renton couple who were found slain in their home on Saturday, according to the King County Sheriff’s Office.

Detectives with the King County Sheriff’s Office are looking for the grandson of an elderly Renton-area couple who were found dead on Saturday evening.

Michael L. Boysen, 26,  is being sought by investigators in connection with the slayings, said Sgt. Cindi West, a spokeswoman for the sheriff’s office. A warrant has been issued for his arrest, she said.

The victims, 82 and 80 years old, were discovered in their Fairwood home  in the 16200 block of 145 Avenue Southeast around 7 p.m. on Saturday after a relative visited their residence, knocked repeatedly on the door but got no answer, according to the sheriff’s office.

They were last seen alive on Friday, West said.

The sheriff’s office has not disclosed how or when the couple died.

Their car, a red 2001 Chrysler 300 with a license plate 046-XXU, is missing. A statewide alert for the vehicle has been issued, West said.

According to court documents, Boysen has a criminal history that spans a half decade and includes convictions for first-degree robbery and trafficking in stolen property. He was convicted of residential burglary last year and served time in a state prison before being released last week.

Boysen is 5-feet-10 and 170 pounds.