Washington State Patrol is searching for the driver who lost the mattress on Interstate 5 Saturday morning.
More: https://www.king5.com/article/traffic/traffic-news/south-seattle-college-student-identified-as-person-killed-on-i-5-after-striking-loose-mattress/281-b0d88737-58de-458f-9d34-5aa926e8c9c5
source
