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BELLINGHAM, Wash. (AP) — Officials say a pilot is dead after a small plane headed to Bellingham for maintenance crashed in the Chuckanut Mountains in northwestern Washington.

Federal officials say the single-engine Mooney M20K departed from Paine Field in Everett and crashed near the Bellingham International Airport Monday night.

The cause of the crash is unknown.

A U.S. Customs and Border Patrol helicopter found the wreckage using a signal from the plane’s last known location and direction of travel.

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Whatcom County Undersheriff Jeff Parks says only the pilot was on board the plane when it crashed.

Whatcom County medical examiner Dr. Gary Goldfogel says the pilot was 61-year-old Don Stanwyck.

Goldfogel says his cause of death is under continuing investigation and that Stanwyck had pre-existing heart disease that may have created a medical emergency and partial explanation for the crash.

The National Transportation Board will investigate.