The following information came from The Burlington Free Press:
http://www.burlingtonfreepress.com/Firefighter hit by truck had medical problem
MARLBORO, Vt. (AP) — Police say it's likely a 68-year-old Marlboro firefighter who died Thursday suffered some sort of medical event that caused him to fall behind a fire truck as it was being backed up at an accident scene.
The Vermont State Police says that Marlboro Assistant Chief John Horton suffered severe traumatic injuries after being run over by a wheel of a town fire truck that had responded to a traffic accident.
The cause of death is listed as blunt force trauma and coronary artery disease.
Police say driver Anthony Gordon saw Horton in his rear view mirror, but when he didn't see Horton again, he found him lying on the ground.
Horton was pronounced dead at a hospital.
The investigation is continuing.