Charges have been filed against Enumclaw resident Michelle Oster for allegedly causing Sunday’s fatal three-car wreck on state Route 410.

Oster, who also goes by the last name Walton-Thomas, was officially charged with two counts of vehicular homicide and two counts of vehicular assault on Oct. 16.

According to King County Superior Court and police documents, first responders received a call of a three-car crash around 11:28 a.m.

Initial witnesses told the Washington State Patrol that Oster attempted to pass multiple vehicles while driving west on the highway by merging into the eastbound lane in a no-passing zone.

Another added that they were driving at 55 mph when Oster attempted to pass them “going considerably faster,” the police report reads, and that Oster was trying to pass up to eight or ten vehicles.

When a Honda Fit traveling east became visible, Oster attempted to get back into the westbound lane but struck a Subaru that was also going west. This caused the Subaru to rotate into the eastbound lane, where the Honda T-boned into the passenger side.

Jenna Rheuben, Kelly Nakata, and a dog were in the Honda; the two suffered major injuries and had to be flown to Harborview Hospital, and the dog was taken to an emergency vet.

Kim Nordberg and Bette Nordberg in the Subaru were dead when first responders arrived, and two dogs in their vehicle were also transported to an emergency vet.

Oster was uninjured and was arrested at the scene; prosecutors said in charging documents that she was “more concerned with retrieving her vape pen from her vehicle than the state of the victims. She seemed annoyed and dismissive at the scene.”

She allegedly told troopers that the Subaru driver caused the accident by stepping on the breaks when she tried to merge back into the westbound lane; that she wasn’t speeding, “maybe a ‘little tiny bit, but not much’”; that other people told her she was “‘being safe’”; and that she was trying to get off of Dilaudid, an opioid pain medication.

Oster’s bail was set at $100,000, which she posted immediately, and her arraignment date is scheduled for Oct. 30.

In addition to these charges, Oster has a history of reckless driving, including being charged with negligent driving in 1995, driving under the influence in 2002 and 2003 (she completed a deferred prosecution program), driving with a suspended license in 2003, reckless driving in 2009, and speeding over 17 mph ion 2018.

The charges against Oster are only allegations, and she is presumed innocent until they are proven guilty in a court of law.