Washington state authorities are looking for a man accused of killing his grandparents in Renton, Wash., just hours after getting out of prison.

A King County sheriff's sergeant says 26-year-old Michael "Chad" Boysen went to his grandparents' home after his release Friday. The bodies of the 82-year-old man and 80-year-old woman were found Saturday in their home. Their car, a red 2001 Chrysler 300, is missing.

There have been no reported sightings of the vehicle or tips about Boysen.

The county medical examiner's office says it will release names of the victims after autopsies Monday.

The Washington Department of Corrections says Boysen had been in prison since 2006 on three counts of robbery. He was supposed to check with a community supervision officer within 24 hours of his release.