The Washington State Patrol is investigating a one car, one semi-truck, fatal collision from approximately 4:36 a.m, Aug. 26.

The collision occurred southbound I-405/North of I-90 (mile post 12) in King County.

Detectives and Troopers are seeking witnesses that may have seen the collision, including any event leading up to or following the crash.  If you have any information or know somebody that does, please contact Detective Sergeant Stacy Moate at 425-401-7741 or Detective Greg Wilcoxson at 425-401-7746.