A helicopter crashed Monday afternoon in southern Illinois, killing its pilot, authorities said.

A Bell UH-1H "Huey" helicopter crashed in a field in Oakdale, Illinois, around 1:45 p.m., the Federal Aviation Administration said.

Only the pilot was on board, the FAA said.

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The FAA and the National Transportation Safety Board will investigate the crash, the FAA said.

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The pilot was declared dead at the scene of the crash, Illinois State Police said.

Investigators believed the helicopter hit power lines, causing it to lose control and crash into a cornfield, police said.

Oakdale is about 45 miles southeast of St. Louis, Missouri.