The puzzling incident unfolded at about 10:15 p.m. in the 3100 block of W. Mukilteo Boulevard when local residents heard a collision on the roadway and called 911, said Aaron Snell of the Everett police.
Neighbors also discovered a man lying in the street near the Jeep, which had crashed into a guardrail. First responders started CPR on the man, but he later died at the scene.
Arriving officers learned the Jeep had been traveling west on W. Mukilteo Boulevard when it sideswiped an eastbound vehicle and veered back into its lane before slamming into the guardrail on the north side of the road.
As officers approached, a man got out of the Jeep and ran from the scene. Officers attempted to track the fleeing person with a K-9 police dog but were unsuccessful.
A third person, a woman who also had been in the Jeep, remained at the scene and was detained by officers. She later was taken to the hospital for treatment of non-life-threatening injuries, Snell said.
Investigators are still trying to determine how the man who died got there, since there was no indication that he had been ejected from the Jeep. The Snohomish County Medical Examiner's Office was called to the scene to take custody of the man who died and determine his identity.
Meanwhile, officers continued their search for the man who fled the scene and ultimately were able to find him. He is currently being detained for questioning.
No arrests have been made in the case so far.
Anyone with information is asked to call 911 or the Everett Police Department tip line at (425) 257-8450.