PORTLAND, Ore. (AP) — Federal agents say they have exhausted all leads in the search for a man suspected of fatally shooting an Oregon county road weighmaster before possibly fleeing to the Midwest. A U.S. Marshals spokesman says a driver spotted the vehicle believed to have been driven by 41-year-old Dirck White of Edgefield, Wash., on April 5 near Des Moines, Iowa.

Dirck White (Clackamas Co., OR Sheriff’s Dept. photos)

The witness told police a man was firing a handgun from the car. The Iowa State Patrol responded, a state patrol spokesman said, but couldn’t find the suspect’s car or the person who made the call.

Suspect vehicle

A Clackamas County Sheriff’s Office spokesman says the witness called on a disposable phone, which required police to search for more than a month to track down the witness who made the call.