A woman who worked in the Island County Planning Department was killed in a traffic accident on Fidalgo Island the evening of Dec. 18.

Sonja M. Bratz, a 35-year-old Bellingham resident, died at the scene of the accident on State Highway 20 near the intersection with Lunz Road, according to a report from the Washington State Patrol.

Bratz was headed south on the highway in a 1997 Pontiac Sunfire struck an oncoming 2014 Honda Accord driven by 45-year-old Hope Noyes of Anacortes, the report states.

The State Patrol initially reported that Bratz had crossed the centerline but later determined that was not the case.

Both vehicles came to rest in the southbound lane.

Noyes was injured and transported to Island Hospital. From there, she was airlifted to Harborview Medical Center in Seattle for treatment. The Skagit Valley Herald reported Saturday that she was in serious condition in intensive care.

The collision was reported at 7:36 p.m. Both drivers were wearing seatbelt.

The State Patrol reported that it’s unknown what caused Bratz to cross the centerline but that the collision is under investigation.

The report states that it’s unknown whether drugs or alcohol were factors in the accident.