A tragic, two-car collision on eastbound SR 518 at the intersection of SR 509 resulted in one fatality Saturday afternoon (Oct. 24), according to the Washington State Patrol.

The crash killed Lilliam Portillo, 41, and critically injured her 10-year old son, who was rushed to Harborview Medical Center in Seattle.

The offending driver is Manoj Siwakoti, 20, of Kent. He was arrested, and faces vehicular homicide and assault charges.

Police say that Siwakoti ran a red light where eastbound SR 518 begins, and struck Portillo’s car which was turning left towards Burien.

All lanes were closed shortly after the accident, which occurred around 3:08 p.m.

The State Patrol, King County Sheriff’s Office and Burien/Normandy Park Fire Department personnel were on the scene, and SR 518 was closed for a few hours, and traffic was re-routed from 1st Ave South onto northbound SR 509.

Courtney Donovan Lemus posted this comment to our Facebook page:

I was there on the other side of the road but couldn’t see the driver, just a boy in the front seat. Woman next to me (we were at the stop light and she had a clear view of the whole thing). SUV appeared to jump the red light at high speed to get on the freeway, hitting the Corolla on the drivers side, launching it airborne into the median (which kept it from landing on the car next to me). Plenty of people there to help, didn’t see the driver myself,. I am so very sad for the family, and i hope that the boy recovers.
Red means stop, not rush. I can’t imagine being the person who made that mistake and now has to live with the heartbreaking result.
My driver friend (next to me in the SUV), if you’re reading this, I hope that you made it to your destination safely, you were really shook up.

As we learn more, we’ll update this post (refresh for the latest updates). Here are some relevant Tweets from the WSP:


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7 replies on “Two-car collision kills Mom, injures 10-year old son in Burien Saturday”

  1. This really angers me, how did the 20 years old drink? That’s underage drinking! Hope they punish him to the full extent of law!

      1. Thank you Raquel. My deepest condolences to the whole family. I’m sure she was a very lovely woman.

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