The 16-year-old boy from Victoria fell off his bike and was hit by a car coming the opposite direction on Smokey Point Blvd. near 204th St. N.E. about 9:20 a.m., Kristin Banfield of the city of Arlington said.
The teen, described as a novice rider, was riding in the southbound lane on Smokey Point Blvd. when he pulled out into the northbound lane, Banfield said. He was attempting to pass a large group of riders and fell. A woman driving a car was going below the 35 mph speed limit but she could not stop in time and hit the teen.
Arlington Police and Fire responded but the boy was pronounced dead at the scene.
"Understandably she's very distraught," Banfield said of the driver. "Very upset. I know her heart is broken for this young and his family."
The boy, who was riding with his mom and uncle, was part of a large pack when he decided to pass, she said.
He was riding in the British Columbia Ride to Conquer Cancer and was one of 2,642 riders in the fifth annual event.
The ride is a two-day cycling event that starts in Vancouver and ends at Sammamish River Park in Redmond.