The crash happened on the night of October 17 in the 10600 block of Evergreen Way in Everett.
Witnesses told police a southbound pickup truck suddenly veered right, then sharply over-corrected and crossed six lanes -- three in each direction. The truck hit a power pole before rolling over and hitting a bicyclist.
The truck crashed to a stop in a nearby car lot, ramming several vehicles in the process. Witnesses say the driver was dazed and didn't seem aware of what had just happened.
The bicyclist, 30-year-old Trenton M. Graham, died at the scene.
Witnesses said the pickup driver was driving normally before it erratically swung across all lanes.
After investigating the crash for months, Everett police detectives announced on Tuesday they were referring the incident to the Snohomish County Prosecutor's Office as a vehicular homicide case.
The Prosecutor's Office will review the case and decide if charges are appropriate, according to police.
Police are not identifying the driver of the pickup, only saying he's a 56-year-old Kirkland man.