BORING, Ore. -- Detectives believe a man suspected of killing a Clackamas County worker may be in Iowa, after receiving a citizen tip that someone shot a gun from a car similar to the suspect's vehicle.

Authorities have been looking for 41-year-old Dirck Morgan White of Edgefield, Wash., since Feb. 6.

White was driving a truck loaded with firewood when he was stopped by county weighmaster, 47-year-old Grady Waxenfelter. Waxenfelter was shot and killed, and White left the scene.

Investigators said White may have thought Waxenfelter was a police officer.

More: Clackamas County homicide suspect still on the run

White may have been driving a silver 2004 Mercedes E320 sedan with Washington license plates ANB7070, according to Sgt. Nathan Thompson of the Clackamas County Sheriff's Office.

On April 5, the Iowa State Patrol received a tip from someone who said they saw the suspect's car.

The citizen reported a subject in this vehicle firing a gun out of the vehicle, Thompson said.

Investigators said they would like to speak with the person who called Iowa police, or anyone else who may have seen White or the silver sedan.

Related: Boring shooting suspect wanted for sex crimes

Investigators previously released a surveillance video (below) that shows White at a Clackamas County store just before the murder. Police also created an informational flier to help with the search.

Click here for the printable bulletin (PDF)

A $16,000 reward has been offered for information that leads to White's arrest. Anyone with tips should call 503-723-4949.

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