Troopers investigate deadly single-car crash in Skagit County

The Washington State Patrol (WSP) is investigating a deadly car crash that occurred near Burlington Thursday night.

According to the WSP, at about 9:31 p.m., troopers responded to reports of a single-car crash on southbound Interstate 5 at milepost 230.

Troopers arrived and found a Sedro-Woolley woman, 70, dead at the scene. Her name has been withheld pending notification of next of kin.

Authorities say she was the sole occupant of the vehicle and was wearing a seatbelt.

Investigators report the woman was driving southbound on I-5 when her vehicle left the roadway to the right, traveled down an embankment and struck a fence and tree.

The cause of the crash is unknown, and it has not been determined whether drugs or alcohol were factors.

The incident remains under investigation.

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This is a developing story. Check back for updates.

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