A 37-year-old woman was struck and killed early Sunday morning after running across Sam Rayburn Tollway and into oncoming traffic on an access road, police said.

Plano fatal pedestrian crash What we know: The incident happened shortly before 1:30 a.m. along the eastbound access road of State Highway 121 near Ohio Drive.

According to Plano police, the woman got out of a vehicle on the Sam Rayburn Tollway for unknown reasons and ran south across the highway.