He died at the scene. His identity is not being released because of his age, said trooper Keith Leary with the Washington State Patrol.
The boys family has been notified, Leary said. He is from the Lynnwood area.
All lanes of northbound I-5 initially were shut down after the 2 p.m. incident. For several hours, traffic was funneled through the carpool lane. The backup spanned several miles.
The boy reportedly jumped at the Alderwood Mall Parkway overpass, Leary said. The walkway there sees heavy pedestrian traffic because it connects the mall with surrounding shopping centers.
Troopers have talked to several witnesses who were at the scene, including some who appeared to be with the boy at the time of the incident, Leary said. Witnesses told troopers they tried to grab him as he went over the rail.
The victim fell onto I-5 and was struck by a van driven by a Marysville man. After the van struck the boy, it veered into a pickup driven by a Puyallup woman.
No injuries were reported in the vehicles.
Patrol investigators and the Snohomish County Medical Examiner were at the scene much of Friday afternoon gathering evidence.
An autopsy is planned for Monday, Leary said.
Rikki King: 425-339-3449; firstname.lastname@example.org.
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