Whitehead was a Marysville resident, according to state voting registration records.
He had no prior felony history in Washington, court records indicate.
The southbound lanes of I-5 were closed for five hours Monday night at the Ship Canal Bridge in Seattle, where the man stopped his truck, lit it ablaze and spray-painted a large green circle on the freeway.
The man brandished a knife when state troopers arrived. A Taser deployed by a trooper had no effect on him. He advanced toward troopers with his knife, prompting two troopers to shoot him.
He was declared dead at Harborview Medical Center shortly after he arrived there. The medical examiner's office reports he died of multiple gunshot wounds.
The incident caused miles of backed-up traffic in the city.
The troopers who fired the shots have been identified as 29-year-old Andrew Boyer, a seven-year veteran who is the son of retired trooper and Kitsap County Sheriff Steve Boyer, as well as 29-year-old Christopher Kyle, who has been with the patrol for two years.