A 24-year-old man hanging outside a moving car Tuesday night on Sunset Boulevard suffered substantial head injuries when he was ejected after the driver braked, according to the Renton Police Department.

The call came in at about 11:15 p.m. that an injured man was laying on the pavement on Sunset Boulevard North where it passes under Interstate 405. He was unconscious and had suffered substantial head injuries, according to police.

A passenger in car northbound on Sunset, he apparently climbed out of his seat and was sitting with his body outside the car and his legs inside the car, according to the preliminary investigation.

The car’s driver startled and braked, and the male was ejected from the car, according to police.

He was transported to Harborview Medical Center with life-threatening injuries.

The driver, a 22-year-old woman, was arrested for investigation of driving while driving under the influence of drugs or alcohol. She was released but could face additional charges once the investigation is completed, according to police.

The investigation will determine how fast she was driving.

Anyone who witnessed this incident is asked to contact Traffic Investigator Hyett at 425-430-7500 and refer to case number 14-11070.