Billings Police are investigating after a hit-and-run early Tuesday morning.
It happened on the east side of 8th Street West and Alderson Avenue just before 1:30 am.
Police say a 20-year-old man and woman were walking on the sidewalk when a 21-year-old female driver hit the man with an older model, yellow Ford Mustang.
Police say she then attempted to leave the scene but was later stopped by an MSU Billings police officer. She was arrested on pending charges.
The hit-and-run victim is at the hospital with serious head injuries. The woman with him wasn't hurt.
According to police, alcohol and speed both were factors.
Traffic was impacted in the area but roads are now back open.