Published: Jul 14, 2014 3:41 PM EDT

SEVILLE, Fla. (AP) - Authorities say a 68-year-old central Florida man is dead after being trapped under a riding lawn mower that apparently fell off the back of a trailer while he was sitting on it.
    
The body of Michael Giles was spotted Sunday evening by someone who was passing by the area near Seville in central Florida.
    
Florida Highway Patrol Sgt. Kim Montes says Giles' 2011 Ford pickup truck with a trailer attached was still running as it was parked along the side of a road.
    
Troopers believe Giles climbed onto the mower after parking his truck. It was not secured and may have shifted at some point.
    
Montes says the mower fell off the trailer, pinning Giles.
    
An investigation is underway.

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(Mower pictured here is not the one that was involved in the accident.)