The driver, a woman from Everett, was not impaired by alcohol or drugs, police said.

LYNNWOOD — A driver was not arrested Thursday after she crossed over the oncoming lane of 188th Street SW, killing a woman on the sidewalk and injuring a man when her car plowed into a garage.

The driver showed no obvious signs of impairment, Lynnwood Police Deputy Chief Jim Nelson said Friday.

“We know how the accident occurred, but we don’t know why the accident occurred,” Nelson said.

The Everett woman, in her mid-20s, was driving west around 6:15 p.m. Thursday on 188th when she crossed into eastbound lanes.

At first, police reported that the pedestrian was crossing the street when she was hit. Later, police corrected their statement to say the Lynnwood woman, in her 50s, was on the south-side sidewalk when the Honda CRV lurched over a curb and hit her. The Honda kept going west on the sidewalk for another 70 feet, Nelson said.

At the southwest corner of the intersection with 48th Avenue W, the Honda drove into a yard, then slammed into a garage. A resident, in his 60s, suffered injuries that were not life-threatening.

He was released from a local hospital Thursday.

The woman who was killed was carried by the car for several hundred feet, Nelson said. She was thrown off in the yard.

She died at the scene. Her identity has not been released.

Officers secured a warrant to draw blood from the Everett woman to test for drugs and alcohol.

She was released from a hospital late Thursday.

Police were “looking at all potential contributory causes,” Nelson said.

That stretch of 188th Street is a residential arterial with a bike lane, in a neighborhood of single-family houses near Lynnwood Elementary School. It’s between Alderwood mall and Highway 99.

Caleb Hutton: 425-339-3454; chutton@heraldnet.com. Twitter: @snocaleb.