Joseph Harvey, 35, was being treated at Harborview Medical Center in Seattle, said his brother, John Harvey.
Joseph Harvey is a tribal member and attended Arlington High School, according to his family.
He was in critical condition Wednesday, hospital officials said.
The collision was reported about 6:45 p.m. Tuesday along 35th Avenue NE, just west of I-5.
The Snohomish County sheriff's collision detectives are investigating.
The driver stayed at the scene and called 911, sheriff's spokeswoman Shari Ireton said. At this point in the investigation, police don't expect to seek criminal charges.
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