State troopers responded to the scene, off the C-Line Road, at about 8:25 p.m. after receiving a report of a serious rollover crash.
The victim, identified later as Alistair G. Martz, 18, of Olympia, was found dead at the scene. The driver and two other passengers in the vehicle were not injured.
A preliminary investigation found that Martz was standing with his upper body through the sun roof of the 1996 Toyota 4Runner SUV when the vehicle slammed into a solid obstruction and rolled over.
The cause of the crash was determined to be reckless driving.
The driver of the SUV, identified as Bradley R. Williams, 23, of Lacey, was arrested and booked into the Thurston County jail for investigation of vehicular homicide.
It is unknown whether drugs or alcohol played a role in the crash.