A 21-year-old woman was arrested early Tuesday after a hit-and-run that hospitalized a 20-year-old man with life-threatening head injuries, according to the Billings Police Department.

The man had been walking with a woman on the sidewalk at the intersection of Eighth Street West and Alderson Avenue when he was struck by a Ford Mustang, police Sgt. Pat Curry stated in a press release. The incident was called in to police at 1:29 a.m.

The woman driving the car left the scene, but was later stopped by a Montana State University Billings Police officer, the release stated.

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Alcohol and speed were suspected to be factors in the collision. The woman who had also been walking on the sidewalk was uninjured, according to the release.

As of 6:20 a.m., Curry said the man remained in critical condition.

None of the individuals' names have been released.

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