Traffic was backed up over a mile on northbound I-5 near SeaTac on Thursday night due to a deadly multi-car crash.
The crash was first reported along the highway near S 200th Street at around 9:30 p.m., according to the Washington State Department of Transportation (WSDOT).
Initially, lanes were reduced, but by 11 p.m., WSDOT announced that all lanes were blocked and drivers had to exit at SR 516 (exit 149) toward Kent and Des Moines…