A 72-year-old woman pulled over on a Michigan highway outside of Leighton Township with a tire issue.

As she got out of her car, the Grand Rapids woman was killed by a passing vehicle, Michigan State Police say.

Police say she was in the travel lane when she was hit.

The driver was a 44-year-old from Kalamazoo, driving a white Buick Lacrosse, police said. It is unknown if drugs or alcohol were a factor in the accident, according to a news release.

Police did not say what the woman had been driving.

The crash is under investigation.

Leighton Township is about 20 miles south of Grand Rapids.

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