Georgia Trooper Powell Allen says 54-year-old Robert Earl Webb may have fallen asleep, but he also had a history of heart disease, and there was evidence he may have suffered a heart attack just before Thursday's crash.
Allen said Webb, from Laurel, Del., was alive just after the accident but died at the scene.
The truck left the road and traveled 559 feet as it went down a banked roadbed and hit several trees before stopping upright in a water-filled ditch.
Information from: The Florida Times-Union, http://www.jacksonville.com
