A New Hampshire man charged with manslaughter and more for the hit and run deaths of a Waltham police officer and a National Grid utility worker Wednesday will be held without bail until at least a December 14 hearing on whether he is too dangerous to be let out until he goes on trial. Police say he plowed his truck into a work detail and later carjacked a police cruiser at knife point. In addition to manslaughter he is charged with assault with a dangerous weapon for two other National Grid workers who were hurt.
