Police say the couple wanted in a Washington killing and Oregon teen's disappearance were captured in California.

The boyfriend-girlfriend duo suspected in the murder of the male suspect's stepmother as well as the disappearance of his father in Washington state and of a teenager in Oregon days later.

David Joseph Pedersen and Holly Ann Grigsby were arrested Wednesday afternoon by the California Highway Patrol while driving the car owned by the missing Oregon teen.

They were arrested in the area of Yuba City and Sutter, about 50 miles north of Sacramento.

Police have not yet said what the motive might be for the crimes in Everett, Wash., or how the Oregon teen got caught up in whatever ordeal is playing out. But they made it clear that the two suspects -- Pedersen, 31, and Grigsby, 24 -- were likely armed and dangerous.

Police first began looking into Pedersen after his stepmother, Leslie Pedersen, 69, was found dead on Sept. 28 with her hands tied with duct tape and a bloody pillow wrapped around her head. Police said Tuesday they have probable cause to arrest the two suspects on murder charges.

Leslie Pedersen's husband, David Jones Pedersen, also is missing, Everett police said.

The Associated Press contributed to this report.