HYATTSTOWN, Md. (AP) — Police say a Maryland man was run over and killed by his tractor-trailer while working on its brakes.

WTOP-FM reports that 58-year-old James Lee Hobbs was killed late Friday morning while working under the truck at a Montgomery County weigh station. A Maryland State Police trooper had stopped Hobbs for brake violations.

Police spokesman Ron Snyder says the truck was empty at the time. A preliminary investigation found Hobbs had failed to engage the parking brake on the vehicle, which rolled back onto him.

Hobbs was declared dead at the scene. A full investigation has not been completed.

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Information from: WTOP-FM, http://www.wtop.com