A Bucks County man was killed Monday night while setting off illegal fireworks. The Middletown Township Fire Marshal says a three-inch mortar struck him in the head near his home in the Upper Orchard section of Levittown.  A fireworks website says the mortars are the biggest and best, and it doesn’t get any bigger.  Neighbors say the victim, 51-year-old Ray Criblear, had been entertaining local children for years with Fourth of July fireworks.