Speed was cited as the cause of the crash.
WSP detectives say they continue to examine all aspects of what led to this collision and are seeking additional witnesses.
It was a head-on crash involving a wrong-way driver on I-5.
WSP investigators say drugs and/or alcohol were involved in the crash.
The Washington State Patrol is investigating.
The pickup drove head-on into a parked semi truck parked illegally.
The driver was charged with DUI, reckless driving and reckless endangerment.
Bystanders were performing CPR when aid crews arrived.
Both lanes of I-5 southbound were blocked.