Thurston County Sheriff's Lt. Greg Elwin said the 41-year-old Lacey man who was hit was airlifted to Harborview Medical Center in Seattle for treatment of head trauma, a brain bleed, 7 broken ribs and a punctured lung.
One witness said the crash was as loud as a "big explosion" and "sounded like an airplane had fallen out of the sky."
The suspected drunk driver, later identified as 35-year-old Tyreen Wells, was taken to Providence St. Peter Hospital in Olympia to be treated for minor injuries.
Elwin said the chase began about 10:30 p.m. when a sheriff's deputy pulled the woman over for allegedly running a stop sign near the intersection of Steilacoom Road SE and Avalon Court SE.
"He asked her to step out of the car for some field sobriety tests and instead of getting out she puts the car in drive and speeds away," Elwin said.
The deputy got back in his patrol car and was trying to catch up with the woman's car when she ran a 4-way stop and slammed into the side of the other car, driven by 41-year-old Andrew Kill.
The State Patrol says Wells only has an I.D. card - not a license to drive. They say this is now the fifth time she's been caught behind the wheel illegally. She was booked into jail and ordered held on $100,000 bail.
Elwin said the Washington State Patrol will be handling the investigation since the sheriff's deputy was involved in the chase before the crash.