BOYNE CITY, Mich. (AP) — The second fatal plane crash in three days in northern Michigan killed the pilot and his passenger, authorities said Monday.

Pilot Kenneth Daniel Yott, 61, of Pontiac and 21-year-old passenger Corbin Dennis Kennedy of Howell were found dead Monday afternoon in the Beechcraft King Airplane in a wooded area in Charlevoix County’s Melrose Township, police said.

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It wasn’t clear what caused the crash. The Federal Aviation Administration and the National Transportation Safety Board are investigating.

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Four people died in a plane crash Saturday on Michigan’s Beaver Island west of Mackinaw City. The twin-engine Britten-Norman plane was flying from Charlevoix, the FAA said in a statement.

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