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BOONE COUNTY, Mo. – A Boone County Fire Protection District assistant chief was killed while assisting at the scene of a crash on I-70 at mile marker 135.

It happened around 4:30 a.m. Wednesday, according to the Missouri Highway Patrol.

Troopers said a tractor-trailer going westbound hit Bryant Gadney’s vehicle at a high rate of speed. The tractor-trailer then hit an ambulance and the original truck involved.

Crews transported Gadney to University Hospital, where he was pronounced dead.

No other people were injured.

Westbound I-70 was closed for several hours as Missouri State Highway Patrol investigated.